MEMORANDUM OPINION
Presently before the Court is defendants’ motion to compel discovery and required disclosures pursuant to Federal Rule of Civil Procedure 26(a)(2) (Doc. No. 84), plaintiffs response in opposition to defendants’ motion to compel discovery and cross-motion for limited protective order (Doe. No. 88), defendants’ reply thereto (Doc. No. 90), and plaintiffs sur-reply memorandum in further response to defendants’ motion to compel (Doc. No. 95).
For the following reasons, this Court grants in part and denies in part both motions (Doc. No. 84, 88).
I. Defendants’ Motion to Compel
Defendants seek the production of all information “considered” by plaintiffs damages expert, John Stavros, in fashioning his conclusions in accordance with Federal Rule of Civil Procedure 26(a)(2) (“Rule 26(a)(2)”). (See Def. Br., at 7). Defendants seek this information regardless of its privileged status, arguing that Rule 26(a)(2) trumps or waives any type of privilege against disclosure. (Id., at 8-18).
In response, plaintiff agrees to produce various categories of information that plaintiffs expert reviewed prior to issuing his expert report, subject to the execution of a confidentiality agreement as to several categories of documents. (See PI. Br., at 8-12). However, plaintiff still refuses to produce three types of information: (a) notes of plaintiffs expert during a September 23, 2005 meeting between plaintiff and plaintiffs in-house counsel, outside counsel, and expert; (b) the content of oral conversations between plaintiff, plaintiffs expert, and/or plaintiffs counsel; and (c) unredacted versions of documents reviewed by plaintiffs expert, including e-mails requesting and/or receiving information from plaintiff and sales charts predating third-party discovery. (Id., at 8, 10, 12-13, 14-23). Plaintiff contends that this information is protected against disclosure by virtue of the core work product privilege and/or the attorney-client privilege. (Id., at 24).
A. Rule 26(a)(2)(B) requires the disclosure of all privileged information considered by a testifying expert.
Resolution of this discovery dispute requires an interpretation of the interaction between Rule 26(a)(2)(B), Rule 26(b)(3), Rule 26(b)(4), and the attorney-client privilege.1 *462This, in turn, requires an analysis of the discovery modifications imposed by the 1993 amendments to Rule 26.
Prior to 1993, parties were limited both in what they could discover from testifying experts and in how they could obtain this discovery. Expert testimony was only discoverable if “known” and relied upon by the expert. See Fed.R.Civ.P. 26(b)(4) (1992); Duke Oishi, A Piece of Mind for Peace of Mind: Federal Discoverability of Opinion Work Product Provided to Expert Witnesses And Its Implications in Hawaii, 24 U. Haw. L.Rev. 859, 868 (2002) (addressing differences between pre-1993 expert discovery rules and post-1993 expert discovery rules). Moreover, interrogatories were the only method of taking discovery of expert witnesses, as permitted by Rule 26(b)(4)(A)®, unless the presiding court granted a “motion” for leave to take further discovery.2 See Fed.R.Civ.P. 26(b)(4)(i)-(ii) (1992); Suskind v. Home Depot Corp., 2001 WL 92183, at *3 (D.Mass. Jan.2, 2001).
The 1993 amendments, which imposed mandatory disclosure obligations on testifying experts, broadened the scope of discoverable information and the methodology for obtaining this information. Rule 26(b)(4) was expanded to permit the taking of depositions of testifying experts. See Fed.R.Civ.P. 26(b)(4) (2005). Furthermore, Rule 26(a)(2)(B) was added to require testifying experts to submit an expert report, which, in turn, must disclose, inter alia, “the data or other information considered by the witness in forming the opinions.” Id. (emphasis added). The advisory committee notes accompanying the 1993 amendments to Rule 26 identify the objectives behind this mandatory report:
The report is to disclose the data and other information considered by the expert ... Given this obligation of disclosure, litigants should no longer be able to argue that materials furnished to their experts to be used in forming their opinions-whether or not ultimately relied upon by the expert-are privileged or otherwise protected from disclosure when such persons are testifying or being deposed.
Id. (emphasis added).
The advisory committee notes to the 1993 amendments to Rule 26 provide express instruction on how to interpret both the requirement that the expert report disclose all “information considered” by the expert witness and the scope of relevant and suitable inquiry during the expert’s deposition pursuant to Rule 26(4)(a). See Mississippi Publishing Corp. v. Murphree, 326 U.S. 438, 444, 66 S.Ct. 242, 90 L.Ed. 185 (1946); 4 Wright & Miller, Federal Practice and Procedure § 1029 (3d ed. 2002) (“In interpreting the federal rules, the Advisory Committee Notes are a very important source of information *463and direction and should be given considerable weight.”). For instance, it is clear from such commentary that the term “considered” in Rule 26(a)(2)(B) exceeds the more narrow definition of “relied upon,” referring instead to any information furnished to a testifying expert that such an expert generates, reviews, reflects upon, reads, and/or uses in connection with the formulation of his opinions, even if such information is ultimately rejected. See, e.g., Amway Corp. v. Procter & Gamble Co., 2001 WL 1877268, at *1 (W.D.Mich. April 17, 2001) (documents supplied to testifying expert, but not read, reviewed, or considered in forming opinions, not discoverable under Rule 26(a)(2)(B)); Vitalo v. Cabot Corp., 212 F.R.D. 472, 474 (E.D.Pa.2002) (defining “consider” in Rule 26(a)(2)(B) as reflecting on, reviewing, or using, even if ultimately rejected by expert). It is equally clear that the disclosure requirements of Rule 26(a)(2)(B) were meant to trump all claims of privilege, mandating production of all information furnished to the testifying expert for consideration in the formulation of her opinions, regardless of privilege. Finally, the 1993 advisory committee notes to Rule 26 fail to distinguish between types of “privilege,” such as the attorney-client privilege or the work product privilege codified in Rule 26(b)(3). See 8 Wright, Miller, & Marcus, Federal Practice and Procedure § 2016.2, at 252 (2d ed.1994) (“the disclosure requirements of Rule 26(a)(2), adopted in 1993, were intended to pretermit further discussion and mandate disclosure despite privilege”).
Despite the clear intent behind Rule 26(a)(2)(B), jurisprudential division exists among federal courts over how to interpret the interplay between Rule 26(a)(2)(B), Rule 26(b)(4), and the attorney-client and work product privileges. Compare Krisa v. Equitable Life Assurance Soc’y, 196 F.R.D. 254, 259 (M.D.Pa.2000) (finding that disclosure of core work product to a testifying expert does not abrogate the privilege that attaches to such materials) with Suskind, 2001 WL 92183, at *6 (“present weight of the caselaw tends to be in favor of allowing discovery of core attorney work product materials which have been considered by an expert”). This division, however, is hardly balanced, as the overwhelming majority of courts addressing this issue have adopted a pro-discovery position, concluding that, pursuant to Rule 26(a)(2)(B), a party must disclose all information provided to its testifying expert for consideration in the expert’s report, including information otherwise protected by the attorney-client privilege or the work product privilege. See, e.g., In re Pioneer Hi-Bred, Int'l, Inc., 238 F.3d 1370, 1375-1376 (Fed.Cir.2001) (“fundamental fairness requires disclosure of all information supplied to a testifying expert in connection with his testimony,” regardless of whether such information falls under the attorney-client or core work product privilege); Colindres v. Quietflex Mfg., 228 F.R.D. 567, 571 (S.D.Tex.2005) (“information that the expert creates or reviews related to his or her role as a testifying expert must be produced,” even when materials are privileged); Am. Fidelity Assurance Co. v. Boyer, 225 F.R.D. 520, 521 (D.S.C.2004) (requiring disclosure of core attorney work product materials that were used or consulted in preparation of expert report); Cornell Research Found., Inc. v. Hewlett, 223 F.R.D. 55, 78-79 (N.D.N.Y.2003) (disclosure of work product materials to testifying expert overcomes privilege); CP Kelco U.S. Inc. v. Pharmacia Corp., 213 F.R.D. 176, 178-179 (D.Del.2003) (requiring production of documents, which implicate the attorney-client privilege, reviewed by testifying expert because it would be “manifestly unfair to allow a party to use the privilege to shield information which it had deliberately chosen to use offensively”); Vitalo v. Cabot Corp., 212 F.R.D. 478, 479 (E.D.Pa.2002) (“Rule 26(a)(2)(B) ... vitiates a claim of attorney work product with respect to any information considered by a party’s expert, whether or not relied upon by that expert”); In re McRae, 295 B.R. 676, 679 (Bankr.N.D.Fla.2003) (materials furnished to testifying expert must be disclosed because “plain meaning of Rule 26(a)(2) trumps protections afforded by attorney-client privilege and work product doctrine”). These courts reason that the disclosure of privileged materials to a testifying expert to formulate her testimony assumes that such materials will be made public or put at issue in the litigation, and effectuates a waiver to the same extent as *464any other disclosure. See In re Pioneer Hi-Bred Int’l, Inc., 238 F.3d at 1375-1376 (finding waiver of attorney-client and work product privileges upon disclosure of confidential communications to testifying experts); United States Fid. & Guar. Co. v. Braspetro Oil Serv. Co., 2002 WL 15652, at *5-6 (S.D.N.Y. Jan.7, 2002) (finding waiver of attorney-client privilege when testifying expert reviews electronic disks containing otherwise privileged information); Paul Rice, 2 Attorney-Client Privilege in the United States § 9:33 (2005) (when an expert witness considers confidential attorney-client communications in developing her testimony, offering of opinions constitutes waiver of attorney-client privilege for those communications). Furthermore, this bright-line rule serves important policy considerations, including the facilitation of effective cross-examination and the resolution of uncertainty as to the discoverability of documentation divulged to a testifying expert. See, e.g., Musselman v. Phillips, 176 F.R.D. 194, 198 (D.Md.1997) (outlining policy considerations behind pro-discovery interpretation of Rule 26(a)(2)(B)).
This Court interprets Rule 26(a)(2)(B) as requiring disclosure of all information, whether privileged or not, that a testifying expert generates, reviews, reflects upon, reads, and/or uses in connection with the formulation of his opinions, even if the testifying expert ultimately rejects the information. See Luther Hajek, Guise, Contrivance, or Artful Dodging?: The Discovery Rules Governing Testifying Employee Experts, 24 Rev. Litig. 301, 315 (2005) (“Rule 26(a)(2)(B) precludes litigants from asserting work product and attorney-client privileges to prevent disclosure of documents and other information disclosed to an expert”). The Court finds that this interpretation best comports with the advisory committee notes to the 1993 amendment to Rule 26, the great weight of the case-law interpreting Rule 26(a)(2)(B), and the policies behind the relevant evidentiary privileges.
B. Application
This Court now applies its interpretation of Rule 26(a)(2)(B) to the various documents and information that defendants seek to compel.
1. Materials Furnished to Plaintiffs Expert
The Court finds that plaintiff must disclose all materials, regardless of privilege, that plaintiffs expert generated, reviewed, reflected upon, read, and/or used in formulating his conclusions, even if these materials were ultimately rejected by plaintiffs expert in reaching his opinions. This includes disclosure, in whatever form the expert received them, of materials that plaintiffs counsel supplied to plaintiffs expert, including emails, summaries of lost sales, summary spreadsheets, pleadings, corporate information, sales charts and breakdowns, time analyses, retainer letters and invoices, and draft expert reports.3
2. Expert Notes of the September 23, 2005 Meeting
This Court finds that plaintiff must produce those notes of the September 23, 2005 meeting that plaintiffs expert created in his role as a testifying expert, regardless of whether these notes contain information that falls under the protection of the attorney-client privilege or the work product privilege.4 These notes may contain information that bears on the credibility of plaintiffs expert, his report, and his trial testimony; *465and therefore are discoverable pursuant to Rule 26(a)(2)(B) and Rule 26(b)(4). See B.C.F. Oil Refining, Inc. v. Consolidated Edison Co. Of New York, Inc., 171 F.R.D. 57, 62 (S.D.N.Y.1997) (discovery obligations apply to documents considered or generated by testifying expert).
However, in requiring this disclosure, the Court imposes two caveats. First, defendants are not entitled to any notes memorializing conversations unrelated to the instant case. (See PI. Br., at 12) (noting that participants discussed a wide range of topics in both this case and a number of others). Second, defendants are not entitled to notes that have no relation to the expert’s role as a testifying expert on the issue of damages, such as notes unrelated to the subject matter of plaintiffs expert testimony. See, e.g., Colindres, 228 F.R.D. at 571; B.C.F. Oil Refining, Inc., 171 F.R.D. at 62 (Rule 26(a)(2)(B) does not require disclosure of documents having no relation to expert’s role as testifying expert); Theodore Banks, 2 Successful Partnering Between Inside and Outside Counsel § 33:34 (2004) (“the disclosure requirements of Rule 26 arguably should only apply to privileged communications or other materials concerning subjects that are related to the topics upon which the expert has been retained to testify, and a testifying expert’s mere access to other privileged documents, or presence during unrelated privileged communications, should have no bearing whatsoever on privilege considerations”).
3. Oral Communications Between Plaintiff, Plaintiffs Expert, and/or Plaintiffs Counsel
Plaintiffs expert must disclose the content of all oral communications that plaintiffs expert considered in formulating his opinions as a testifying expert in this case, regardless of whether these oral communications come from plaintiffs counsel or plaintiff itself. The Court sees no principled distinction between the discoverability of oral and written communications that a testifying expert considers in fashioning her opinions. See, e.g., Fed.R.Civ.P. 26(a)(2)(B) (requiring disclosure of “data or other information” considered by testifying expert); TV-3, Inc. v. Royal Ins. Co. Of Am., 193 F.R.D. 490, 492 (S.D.Miss.2000) (requiring disclosure of all documents and oral communications reviewed by experts in connection with formulating opinions, even those ultimately rejected or not relied upon). Nor does the case-law expressly make such a distinction. See, e.g., B.C.F. Oil Refining, Inc., 171 F.R.D. at 67 (“there does not seem to be a principled difference between oral and written communications between an expert and an attorney insofar as discoverability is concerned”); Karn v. Ingersoll-Rand Co., 168 F.R.D. 633, 640 (N.D.Ind.1996); Theodore Banks, 2 Successful Partnering Between Inside and Outside Counsel § 33.34 (noting that “many courts permit discovery of oral communications between a corporation’s counsel and their testifying expert”). Consequently, although plaintiffs expert need not disclose the content of privileged communications that plaintiffs expert never considered in formulating his opinion as to damages in the instant ease, as such communications would not fall within the scope of Rule 26(a)(2)(B) and therefore would retain their privileged status, plaintiffs expert must nonetheless disclose the content of all oral communications between plaintiff, plaintiffs attorney, and/or plaintiffs expert that plaintiffs expert considered in fashioning his conclusions in this litigation.
II. Plaintiffs Motion for a Limited Protective Order
Plaintiff cross-moves for a limited “mirror image” protective order under Rule 26(c). (See PI. Br., at 25).
This Court disagrees that plaintiff is entitled to the entirety of the relief requested in its proposed protective order, particularly because this Court has already granted in part defendants’ motion to compel. Nonetheless, this Court agrees that a limited protective order granting some of plaintiffs requested relief would serve the interests of justice and avoid undue harassment and oppression. See Fed.R.Civ.P. 26(c). Accordingly, this Court grants plaintiffs motion for a protective order to the extent that plaintiff seeks to: (a) prohibit disclosure to non-parties of *466the documents that plaintiff must produce pursuant to this Order;5 (b) prohibit non-parties from attending the deposition of plaintiffs expert; and (e) prohibit defendants from asking plaintiffs expert about the content of privileged conversations between plaintiff and its counsel that plaintiffs expert did not consider in formulating his opinions as to damages in the instant case.
III. Conclusion
For the preceding reasons, this Court grants in part and denies in part both defendant’s motion to compel and plaintiffs cross-motion for a protective order. An appropriate Order follows.
ORDER
AND NOW, this 21st day of December 2005, upon consideration of defendants’ motion to compel discovery (Doc. No. 84), plaintiffs response in opposition to defendants’ motion to compel discovery and cross-motion for limited protective order (Doc. No. 88), defendants’ reply thereto (Doc. No. 90), and plaintiffs sur-reply memorandum in further opposition to defendants’ motion to compel (Doc. No. 92), it is hereby ORDERED as follows:
1. Defendants’ motion to compel discovery (Doc. No. 84) is GRANTED in part and DENIED in part according to the following formula:
A. Plaintiff is required to produce, within five days from the date of this Order, all materials generated, reviewed, reflected upon, read, and/or used (“considered”) by plaintiffs’ expert in reaching his conclusions in this litigation, including all materials that would otherwise be privileged.6 This includes, but is not limited to, the categories of documents that plaintiff identifies in his response (Doc. No. 88), such as emails, summaries of lost sales, summary spreadsheets, pleadings, corporate information, sales charts and breakdowns, time analyses, retainer letter and invoices, and draft expert reports;
B. Plaintiff is required to produce, within five days from the date of this Order, those portions of plaintiffs expert notes during the September 23, 2005 meeting that relate both to the instant case and to the expert’s role as a testifying expert on the issue of damages; and
C. Plaintiffs expert is required to disclose, at the resumption of his deposition, all oral communications between plaintiff, plaintiffs expert, and/or plaintiffs counsel that plaintiffs expert considered in formulating his opinions as to damages in this matter.
2. Plaintiffs motion for a limited protective order (Doc. No. 88) is GRANTED in part and DENIED in part according to the following formula:
A. The parties are prohibited from disclosing to non-parties the content of the documents that plaintiff must produce pursuant to this Order;
B. Non-parties are prohibited from attending the deposition of plaintiffs expert;
C. Defendants are prohibited from asking plaintiffs expert about the content of conversations between plaintiff and its counsel that plaintiffs expert did not consider in formulating his opinions as to damages in the instant case; and
D. Plaintiffs motion is DENIED in all other respects.