MEMORANDUM OPINION
This matter comes before the Court on the defendants’ motions to dismiss the plaintiffs complaint pursuant to Federal Rules of Civil Procedure 12(b)(1) and 12(b)(6).1 The plaintiffs complaint seeks both monetary and equitable relief from the defendants for claims involving the disciplinary proceedings related to the plaintiffs disbarment.2 Upon consider*89ation of the parties’ submissions and for the reasons set forth below, the Court must grant the defendants’ motions to dismiss as the plaintiffs claims are precluded either because the Court lacks jurisdiction under the Rooker-Feldman abstention doctrine, the defendants are entitled to absolute judicial immunity, or the plaintiffs challenges to the bar rules are non-justiciable.
I. Factual Background
As a predicate to its legal analysis, the Court finds it appropriate to briefly examine the attorney disciplinary system in the District of Columbia, the plaintiffs actual disciplinary proceedings, and the claims that have been filed by the plaintiff.
(A) The District of Columbia Attorney Disciplinary System
The District of Columbia Court of Appeals (“DCCA”) is vested with the authority to “make such rules as it deems proper respecting the examination, qualification, and admission of persons to membership in its bar, and their censure, suspension, and expulsion.” D.C.Code § ll-2501(a) (2001); see Defs.’ Mot., Memorandum of Points and Authorities in Support of Defendant’s Motion to Dismiss for Failure to State a Claim and Lack of Subject Matter Jurisdiction (“Defs.’ Mem.”) at 2. Pursuant to this authority, the DCCA adopted D.C. Bar Rule XI, § 4, which created the Board of Professional Responsibility (“Board”). This rule grants the Board the “power and duty to investigate alleged grounds for attorney discipline, to adopt its own rules and procedures, to appoint Bar Counsel, to appoint Hearing Committees to conduct hearings and to submit findings and recommendations to the Board, and to prepare and forward its own findings and recommendations to the court.” D.C. Bar Rule XI, § 4(e) (2002).
The Office of Bar Counsel (“Bar Counsel”) performs the prosecutorial function of the attorney disciplinary system. Its powers and duties include, among others, the power to “investigate all matters involving alleged misconduct by an attorney subject to the disciplinary jurisdiction of [the DCCA] which may come to the attention of Bar Counsel or the Board ... [and to] prosecute all disciplinary proceedings before Hearing Committees, the Board, and the [DCCA].” D.C. Bar Rule XI, § 6(a). The Hearing Committees of the Board have the power and duty to conduct hearings on formal charges and “submit their findings and recommendations to the Board.” D.C. Bar Rule XI, § 5. Once the Hearing Committee gives a recommendation to the Board, the attorneys for either side may file exceptions to the Committee’s recommendation pursuant to D.C. Bar Rule XI, § 9(b). After appropriate consideration of the recommendation and exceptions, the DCCA is then required to issue an order. See D.C. Bar Rule XI, § 9(g)(1). The DCCA typically will accept the Board’s findings, but the court may disregard them, if “they are unsupported by substantial evidence of record” or if acceptance “would foster a tendency toward inconsistent dispositions for comparable conduct or would otherwise be unwarranted.” Id.
The Clients’ Security Trust Fund (“Trust Fund”) was created by the DCCA “to consider claims for reimbursement of losses... caused by the dishonest conduct of members of the District of Columbia Bar... provided such member... has *90been disbarred or suspended from the practice of law.” D.C. Bar Rule XII, § 5 (2002). The Attorney Client Arbitration Board (“ACAB”) “was created b[y] the [DCCA] as an alternative dispute resolution mechanism for disputes between attorneys and their clients.” Defs.’ Mem. at 4. All attorneys are “deemed to have agreed to arbitrate disputes over fees for legal services and disbursements related thereto when such arbitration is requested by a present or former client ...” D.C. Bar Rule XIII(a) (2002).
(B) The Plaintiff’s Disciplinary Proceedings
On November 12, 1999, the plaintiff was disbarred by the DCCA as a result of two legal malpractice claims filed against him. See In re Thomas, 740 A.2d 538 (D.C.1999), cert. denied, 529 U.S. 1021, 120 S.Ct. 1425, 146 L.Ed.2d 316 (2000).
In the first disciplinary matter, a former client of the plaintiff filed a complaint with Bar Counsel concerning the plaintiffs alleged mishandling of her escrow account. DCCA Mot., Memorandum of Points and Authorities in Support of Defendant District of Columbia Court of Appeals’ Motion to Dismiss, or in the alternative, for Summary Judgment (“DCCA Mem.”) at 2. On December 22, 1994, Bar Counsel initiated proceedings against the plaintiff and charged him with six violations of the District of Columbia Rules of Professional Conduct. Id. Hearing Committee Number Five (“Committee Five”) found the plaintiff guilty of four of the six charges instituted against him, including: (1) commingling of client’s funds under the District of Columbia Rules of Professional Conduct, Rule 1.15(a) (2003); (2) misappropriation of client’s funds under the District of Columbia Rules of Professional Conduct, Rule 1.15(b) (2003); (3) failing to keep his client reasonably informed under the District of Columbia Rules of Professional Conduct, Rule 1.4(a) (2003); and (4) engaging in acts of dishonesty under the District of Columbia Rules of Professional Conduct, Rule 8.4(c) (2003). DCCA Mem at 3. The plaintiff was recommended for disbarment by Committee Five. Id.
In the second disciplinary matter, another former client of the plaintiff filed a complaint with Bar Counsel regarding the plaintiffs alleged mishandling of a life insurance claim. Bar Counsel charged the plaintiff with violating: (1) Rule 1.15(a) of the Rules of Professional Conduct for failing to safeguard a client’s property in his possession in connection with the legal representation he was providing; and (2) Rule XI, § 9(f) of the DCCA’s Rules Governing the Bar and Rule 1.15(a) for failing to keep complete records of his handling and disposition of funds belonging to another client. Id. at 5. Hearing Committee Number Seven found the plaintiff in violation of both Bar XI, § 9(f) and Rule 1.15(a), and recommended an informal admonition. Id.
On May 7, 1998, after the consolidation of the two disciplinary matters, the Board recommended to the DCCA that the plaintiff be disbarred. The plaintiff was subsequently disbarred by the DCCA in In re Thomas, 740 A.2d 538. The plaintiff then filed a petition for writ of certiorari (“petition”) with the United States Supreme Court, which was denied by the Court on March 20, 2000. See Thomas v. Dist. of Columbia Court of Appeals Bd. on Prof'l Responsibility, 529 U.S. 1021, 120 S.Ct. 1425, 146 L.Ed.2d 316 (2000) (denying cer-tiorari).
(C) Plaintiff’s Claims Filed in this Court
On April 3, 2002, following the Supreme Court’s denial of his petition, the plaintiff filed a complaint with this Court alleging numerous claims against the de*91fendants involving the disciplinary proceedings he was subject to. Specifically, the plaintiff asserts that: (1) defendants, Knight, Becker, and Dicker, violated the plaintiffs Fifth Amendment right to due process by excessively issuing subpoenas duces tecum, Complaint (“Compl.”) ¶ 26; (2) all of the defendants violated the plaintiffs Thirteenth Amendment right by either recommending or affirming his disbarment, Compl. ¶ 61; (3) defendants, Board of Governors of the District of Columbia Bar, Knight, Schaefer, Becker, Peters,3 Dicker, Wolfman, and Silver, made fraudulent communications in violation of the Racketeer Influenced and Corrupt Organizations Act, 18 U.S.C. § 1962(c) (2000) (“RICO”), Compl. ¶¶ 74-75; and (4) defendant Becker defamed the plaintiff by publishing information about his disciplinary proceedings in the Legal Times in May 1997, Compl. ¶ 81. In addition, the plaintiff seeks declaratory relief as to three issues: (1) whether D.C. Bar R. XI, § 1(c) (2002), which states that, “disciplinary proceedings against an attorney shall not be subject to any period of limitation,” is unconstitutional on its face; (2) whether Bar Rule XII, § 5 fails to provide the Trust Fund with the authority to dispense funds as reimbursement of the loss asserted by Silver;4 and (3) whether Bar Counsel lacked jurisdiction and abused its power under Bar Rule XI, § 18(a) (2002) because it failed to comply with the appropriate notice requirements in issuing subpoenas duces tecum pursuant to Super Ct. Civ. R. 5 & 6.5 Compl. ¶¶ 86(A),(B)(C).
*92II. Standards of Review
(A) Rule 12(b)(1)
Federal Rule of Civil Procedure 12(b)(1) requires the plaintiff to bear the burden of establishing by a preponderance of the evidence that the court has jurisdiction to entertain his claims. Fed.R.Civ.P. 12(b)(1); Grand Lodge of Fraternal Order of Police v. Ashcroft, 185 F.Supp.2d 9, 13 (D.D.C.2001); Pitney Bowes, Inc. v. United States Postal Serv., 27 F.Supp.2d 15, 18 (D.D.C.1998); Darden v. United States, 18 Cl.Ct. 855, 859 (Cl.Ct.1989). While the Court must accept as true all the factual allegations contained in the complaint when reviewing a motion to dismiss pursuant to Rule 12(b)(1), Leatherman v. Tarrant County Narcotics Intelligence & Coordination Unit, 507 U.S. 163, 164, 113 S.Ct. 1160, 122 L.Ed.2d 517 (1993), because the plaintiff has the burden of establishing the Court’s jurisdiction, the “ ‘plaintiffs factual allegations in the complaint ... will bear closer scrutiny in resolving a 12(b)(1) motion’ than in resolving a 12(b)(6) motion for failure to state a claim.” Grand Lodge of Fraternal Order of Police, 185 F.Supp.2d at 13-14 (citation omitted). Moreover, the Court has an “affirmative obligation to ensure that it is acting within the scope of its jurisdictional authority.” Id. at 13. Finally, the Court notes that in deciding a Rule 12(b)(1) motion, it is well established in this Circuit that a court is not limited to the allegations in the complaint but may consider material outside of the complaint in an effort to determine whether the court has jurisdiction in the case. See EEOC v. St. Francis Xavier Parochial Sch., 117 F.3d 621, 624-25 n. 3 (D.C.Cir.1997); Herbert v. Nat’l Acad. of Sciences, 974 F.2d 192, 197 (D.C.Cir.1992); Haase v. Sessions, 835 F.2d 902, 906 (D.C.Cir.1987); Hohri v. United States, 782 F.2d 227, 241 (D.C.Cir.1986); Grand Lodge of Fraternal Order of Police, 185 F.Supp.2d at 14.
(B) Rule 12(b)(6)
On a motion to dismiss for failure to state a claim upon which relief can be granted pursuant to Federal Rule of Civil Procedure 12(b)(6), this Court must construe the allegations and facts in the complaint in the light most favorable to the plaintiff and must grant the plaintiff the benefit of all inferences that can be derived from the alleged facts. Conley v. Gibson, 355 U.S. 41, 45-46, 78 S.Ct. 99, 2 L.Ed.2d 80 (1957); Kowal v. MCI Communications Corp., 16 F.3d 1271, 1276 (D.C.Cir.1994). However, the Court need not accept inferences or conclusory allegations that are unsupported by the facts set forth in the complaint. Kowal, 16 F.3d at 1276. In deciding whether to dismiss a claim under Rule 12(b)(6), the Court can only consider the facts alleged in the complaint, documents attached as exhibits or incorporated by reference in the complaint, and matters about which the Court may take judicial notice. St. Francis Xavier Parochial Sch., 117 F.3d at 624-25. The Court will dismiss a claim pursuant to Rule 12(b)(6) only if the defendant can demonstrate “beyond doubt that the plaintiff can prove no set of facts in support of his claim which would entitle him to relief.” Conley, 355 U.S. at 45-46, 78 S.Ct. 99.
III. Legal Analysis
(A) The Rooker-Feldman Abstention Doctrine
A court is obligated at the outset in every case to determine whether it has *93the jurisdiction to consider the plaintiffs claims. Steel Co. v. Citizens for a Better Env’t, 523 U.S. 83, 94, 118 S.Ct. 1003, 140 L.Ed.2d 210 (1998) (a court’s jurisdiction to entertain the plaintiffs complaint must be established as a threshold matter). The Court finds it appropriate to examine first whether the jurisdictional proscription of the Rooker-Feldman abstention doctrine applies to this case. The Rooker-Feldman abstention doctrine derives from the Supreme Court’s decisions in Rooker v. Fidelity Trust Co., 263 U.S. 413, 44 S.Ct. 149, 68 L.Ed. 362 (1923), and District of Columbia Court of Appeals v. Feldman, 460 U.S. 462, 103 S.Ct. 1303, 75 L.Ed.2d 206 (1983), and precludes “a party losing in state court ... from seeking what in substance would be appellate review of the state judgment in a United States district court, based on the losing party’s claim that the state judgment itself violates the loser’s federal rights.” Johnson v. DeGrandy, 512 U.S. 997, 1005-06, 114 S.Ct. 2647, 129 L.Ed.2d 775 (1994); see also Gray v. Poole, 275 F.3d 1113, 1119 (D.C.Cir.2002); Stanton v. District of Columbia Court of Appeals, 127 F.3d 72 (D.C.Cir.1997). The Rooker-Feldman doctrine applies to judicial proceedings and precludes not only those claims that have been already addressed by a state court, but also those that are “inextricably intertwined with the merits of the state-court judgment.” Centifanti v. Nix, 865 F.2d 1422, 1430 (3d Cir.1989) (quoting Pennzoil Co. v. Texaco Inc., 481 U.S. 1, 25, 107 S.Ct. 1519, 95 L.Ed.2d 1 (1987) (Marshall, J., concurring)).
Turning specifically to the application of the Rooker-Feldman doctrine in the attorney disbarment context, including general challenges to bar rules, this Court finds the District of Columbia Circuit’s decision in Stanton particularly instructive in this case. The Stanton Court stated:
In promulgating rather than applying bar rules, however, the DCCA acts in a legislative rather than a judicial capacity. Accordingly, a district court confronted with a simple challenge to the validity of such rules is not reviewing a state-court judicial decision and thus has subject matter jurisdiction. Applying Rooker-Feldman requires us to draw a line between permissible general challenges to rules and impermissible attempts to review judgments. And Feldman also tells us that even a constitutional claim pled as a general attack may be so ‘inextricably intertwined’ with a state court decision that the district court is in essence being called upon to review the state-court decision.
127 F.3d at 75 (citations omitted).
Examining the plaintiffs claims in this case, it is clear that his claims pursuant to the Fifth Amendment regarding Bar Counsel’s issuance of subpoenas duces tecum and his claim that Bar Counsel failed to comply with District of Columbia civil rules in issuing these subpoenas are both directly precluded by the Rooker-Feldman doctrine because the DCCA addressed both of these claims in its decision to disbar the plaintiff. See In re Thomas, 740 A.2d at 545-46. In addition, the plaintiffs Thirteenth Amendment, RICO, and defamation claims are also barred by the Rooker-Feldman abstention doctrine as they are “inextricably intertwined” with the judgment issued by the DCCA in his disciplinary case.6 The plaintiffs Thirteenth Amendment, RICO, and defamation *94claims each involve allegations of wrongdoing during his disciplinary proceedings. Specifically, the plaintiffs Thirteenth Amendment claim alleges that the “Governor, Bar, Board, Arbitration Board, the Trust [Fund] ... had [the] power to prevent or aid in preventing the commission of the acts complained of herein but neglected to do so to [p]laintiffs continuing injury ...” Compl. ¶ 61. The RICO claim’s predicate offense asserts that the “Governors, Knight, Schaefer, Becker, Peters, Dicker, Wolfman, and Silver were each employed by or associated with the Bar ... [and] executed a] scheme ... to defraud and to obtain and subrogate [plaintiffs property and [l]iberty interests] ...” Id. at ¶¶ 74,77. Finally, the plaintiffs defamation claim asserts that defendant Becker published statements that the plaintiff has misappropriated bank trust funds. Id. ¶ 81. Apparently, Bar Counsel published a notice in the “Legal Times” in May 1997 releasing the official reports of the disciplinary proceedings. Defs.’ Mem. at 23-24. In any event, the DCCA found that the plaintiff misappropriated client funds and violated several other rules of the bar. See In re Thomas, 740 A.2d at 543-44. Accordingly, it is clear that each of these latter three claims are “inextricably intertwined” with the decision to disbar the plaintiff, and therefore this Court lacks the subject-matter jurisdiction to entertain those claims.
(B) Absolute Judicial Immunity
In addition, the Court finds it noteworthy that the DCCA, under its authority to regulate the practice of law in the District of Columbia, has promulgated bar rules providing absolute immunity to all but one of the defendants for conduct based on the exercise of their official duties.7 D.C. Bar Rule XI, § 19(a) provides that “[m]embers of the Board, its employees, members of Hearing Committees, Bar Counsel, and all assistants and employees of Bar Counsel shall be immune from disciplinary complaint under this rule and from suit for any conduct in the course of their official duties.” Similarly, D.C. Bar Rule XII, § 14 provides that “[t]he trustees, staff and agents of the Clients’ Security Fund shall be immune from civil liability and disciplinary complaint under this rule and from suit for any conduct in the course of their official duties.” Therefore, because all of the defendants, except for defendant Silver, were acting within the scope of their official duties as the disciplinary arm of the DCCA, they are immune from the plaintiffs Thirteenth Amendment,8 RICO,9 and defamation10 claims.
*95(C) The Plaintiff’s Claim Alleging the Unconstitutionality of D.C. Bar Rule XI, § 1(c)
The plaintiffs final claim is a request for a declaration from this Court that D.C. Bar R. XI, § 1(c) is unconstitutional on its face. Compl. ¶ 86(A). Although this claim lacks any type of particularity, as the plaintiffs complaint fails to provide the purported basis for such a declaration, see Defs.’ Mem at 25, this Court must take pause and examine whether this claim is “inextricably intertwined” with the decision to disbar him, and thus the Court would lack subject-matter jurisdiction pursuant to the Rook-er-Feldman abstention doctrine, or whether it is an independent claim generally challenging the constitutionality of a bar rule, whereby this Court would have jurisdiction to entertain the claim. See Stanton, 127 F.3d at 75. Either way, the Court will dismiss this claim. In Richardson v. District of Columbia Court of Appeals, 83 F.3d 1513 (D.C.Cir.1996), the District of Columbia Circuit Court addressed a constitutional challenge to a bar rule by a suspended attorney and concluded that such a challenge is either precluded by the Rooker-Feldman abstention doctrine or by lack of standing. Id. at 1516. This is because the plaintiffs challenge to the bar rule was either “inextricably intertwined” to his underlying disciplinary action, and thus barred by Roocker-Feldman, or, if independent of the disciplinary action, because the attorney is disbarred, or unable to practice law, he lacks any necessary “personal stake” to comply with standing principles. Id. The Circuit Court in Richardson commented that “the actual application of [the bar rule] is obviously encompassed in the Court of Appeals’s order and review barred under Feldman; imminent application is not in the cards, as [the plaintiff] has already been” subject to disciplinary action by being suspended or disbarred. Id. (emphasis in the original). Thus, the Circuit Court concluded, and this Court finds no reason to hold otherwise, that such a challenge is either barred by the Roofcer-Feldman abstention doctrine as an attack on the plaintiffs actual disciplinary decision or, if “[a]bsent any actual or imminent application to [the plaintiff], it is doubtful that he would have standing to secure adjudication of his general due process claim.” Id. (citing Levin v. Attorney Registration and Disciplinary Commission of the Supreme Court of Ill., 74 F.3d 763, 766-68 (7th Cir.1996)) (“after plaintiff was disbarred, he would lack the ‘personal stake’ needed for an independent constitutional attack on state’s rules concerning disbarment”) (other citations omitted). Finally, this Court finds it significant that the Richardson Court noted the circumstances before it were distinguishable from Feldman. This was because even if the Feldman plaintiffs, who were challenging both the DCCA’s refusal to waive the accreditation requirement for attorneys who had not graduated from American Bar Association accredited law schools and the bar rule under which the District refused to admit such applications, lost their attack on the DCCA’s denial of their actual bar admission waiver requests, they would nonetheless have standing to challenge the general rule itself. Richardson, 83 F.3d at 1515-16 (noting “[b]y contrast, if the Feldman plaintiffs lost their attack on the *96court’s denial i of waivers of the accreditation rule, they might still be positioned to attack the rule itself.”). However, in this case, as in Richardson, the plaintiff no longer has a “personal stake” in the bar rules, ás he has now been disbarred.11
IV. Conclusion
For the aforementioned reasons, this Court must grant the defendants’ motions to dismiss the plaintiffs complaint. This is because this Court lacks the subject-matter jurisdiction to entertain such claims pursuant to the Rooker-Feldman abstention doctrine, the defendants enjoy absolute judicial immunity, or the plaintiffs challenges to the bar rules are non-justiciable.12
ORDER
Upon consideration of the defendants’ motions to dismiss, and for reasons set forth in the Memorandum Opinion accompanying this Order, it is hereby,
ORDERED that the defendants’ motions to dismiss are GRANTED. It is FURTHER ORDERED that the plaintiffs Fifth Amendment, Thirteenth Amendment, RICO, and defamation claims; and his challenge to District of Columbia Bar Rule XI, § 18(a) shall be DISMISSED WITH PREJUDICE. It is
FURTHER ORDERED that the plaintiffs constitutional challenges to District of Columbia Bar Rule XI, § 1(c) and District of Columbia Bar Rule XII, § 5 shall be DISMISSED WITHOUT PREJUDICE.