ORDER ON MOTION TO EXCLUDE TESTIMONY OF DR. SHIRLEY FRY
KANE, Senior District Judge.
This matter is before me on Plaintiffs’ motion to exclude the testimony of Dr. Shirley Fry, as set forth in their Motion to Exclude the Testimonies of Fry, Grogan and Voilleque (Docket # 1728), filed December 4, 2005. Having carefully considered the motion with respect to Dr. Fry, the parties’ subsequent briefing on this subject, the relevant record and all applicable legal authorities, and being fully advised in the premises, I rule as follows:
Defendants offer Dr. Fry in rebuttal to the testimony of Plaintiffs’ expert Dr. Steven Wing. In compliance with Federal Rule of Civil Procedure 26 and the deadlines for expert disclosure I ordered in this case, Plaintiffs designated Dr. Wing as an expert in this matter in May, 1995, and provided his expert report to Defendants in November, 1996. Pursuant to Rule 26(a)(2)(C), Defendants were required to identify and provide an expert report for any expert evidence they intended to present to contradict or rebut Dr. Wing’s expert testimony within 30 days of Plaintiffs’ disclosure of Dr. Wing’s expert report. Fed.R.Civ.P. 26(a)(2)(C); see, e.g., Eckelkamp v. Beste, 315 F.3d 863, 872 (8th Cir.2002); Finley v. Marathon Oil Co., 75 F.3d 1225, 1230 (7th Cir.1996) (Posner, J.); Complaint of Kreta Shipping, S.A., 181 F.R.D. 273, 276 (S.D.N.Y.1998). Defendants did not disclose an expert to rebut Dr. Wing’s expert testimony in December, 1996, as required, and did not request any extension of time to do so. Instead, on October 7, 2005, at the start of trial and immediately after I denied Defendants’ Daubert motion to exclude Dr. Wing’s testimony, Defendants for the first time declared their intent to call Dr. Fry as a rebuttal witness to Dr. Wing. Defendants had not identified Dr. Fry as a [600]*600potential witness, expert or otherwise, on any of their previous witness lists.1
Rule 37(c)(1) provides that a party who without substantial justification fails to disclose information required by Rule 26(a) may not present this information as evidence at trial. This sanction is mandatory unless the non-disclosing party shows substantial justification or that the failure to disclose was harmless. See, e.g., Fed.R.Civ.P. 37(c)(1) (Adv. Comm. Note 1993); see Jacobsen v. Deseret Book Co., 287 F.3d 936, 952-53 (10th Cir.2002).2 This rule applies to rebuttal expert testimony that was not disclosed in compliance with Rule 26(a). See, e.g., Finley, 75 F.3d at 1230 (affirming exclusion of rebuttal evidence presented by expert witness because the evidence was not disclosed as required by Rule 26(a)); Congressional Air, Ltd. v. Beech Aircraft Corp., 176 F.R.D. 513, 515-16 (D.Md.1997) (same). Accordingly, unless Defendants had substantial justification for failing to disclose Dr. Fry’s testimony in December, 1996, she may not testify as a expert in rebuttal to Dr. Wing’s properly disclosed expert testimony.3
The only justification offered by Defendants for their failure to disclose Dr. Fry is that Plaintiffs’ inadvertent omission of Dr. Wing from their December, 2003 preliminary witness list led them to believe Dr. Wing would not testify at trial. Any confusion on this score was temporary, however, as Plaintiffs notified Defendants in July, 2004, more than a year before trial, that Dr. Wing was still a potential expert witness in this case. More importantly, Plaintiffs’ final decision on whether to call Dr. Wing at trial has nothing to do with the timing of Defendants’ obligation under the Federal Rules to provide disclosure of any expert testimony in rebuttal to Dr. Wing’s testimony. That obligation was triggered in November, 1996 when Plaintiffs disclosed Dr. Wing’s intended expert testimony, and required Defendants to disclose any expert evidence to contradict or rebut Dr. Wing’s expert testimony 30 days later, in December, 1996.4
Defendants argue I ruled that Dr. Fry could testify in rebuttal to Dr. Wing based on statements I made on October 7, 2005, immediately after Defendants for the first time stated their intent to call Dr. Fry as a rebuttal witness. Plaintiffs had had no discovery at that time regarding Dr. Fry and the scope of her intended testimony. Although Dr. Fry has not submitted an expert report, she was deposed by Plaintiffs on December 7. I now make my final ruling based on this more complete record.
Under this record, I hold that Dr. Fry may not present expert testimony in this case, in rebuttal to Dr. Wing or otherwise, because Defendants failed to comply with the expert disclosure requirements set out above and that failure was not substantially justified or harmless.
[601]*601That brings me to Defendants’ final argument, which is that Dr. Fry’s intended rebuttal testimony is not expert testimony at all and thus is not subject to these disclosure requirements, or, for that matter, the reliability requirements for expert testimony set forth in Fed.R.Evid. 702. Defendants assert this is so because Dr. Fry has personal knowledge of Dr. Wing and “of the field of epidemiology at DOE” as a result of her years of experience as a DOE epidemiologist. See Defs.’ Resp. (Docket # 1745) at 4; Defs.’ Resp. to Pis.’ Supp. (Docket # 1823) at 2. As a consequence, Defendants argue, Dr. Fry “can factually testify as to the work with which she is familiar” at DOE as a lay witness under Fed.R.Evid. 701. See Defs’ Resp. (# 1745) at 4.
Defendants assert they will question Dr. Fry regarding two specific areas of which she has personal knowledge: (1) “attempts to influence or limit epidemiological studies of workers at DOE nuclear facilities, including [Dr. Wing’s] own mortality study of Oak Ridge workers; and (2) the structure of the DOE radiation epidemiology program and the studies conducted under that program.” Defs’ Resp. to Pis’ Supp. (Docket # 1823) at 1. Defendants have stated that Dr. Fry’s testimony on these subjects is intended to rebut Dr. Wing’s testimony suggesting “that the DOE epidemiological studies were not credible, were inadequate and that the DOE’s purported ‘conflict of interest’ affected that science.” Defs’ Resp. (Docket # 1745) at 4.
An expert witness is “a witness qualified as an expert by knowledge, skill, experience, training or education” whose “scientific, technical or other specialized knowledge will assist the trier of fact to understand the evidence or to determine a fact in issue.” Fed. R.Evid. 702. By definition, therefore, an expert witness has personal knowledge of their field and of the matters on which they are to testify, or they would not be qualified to testify as an expert. As a result, that Dr.
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ORDER ON MOTION TO EXCLUDE TESTIMONY OF DR. SHIRLEY FRY
KANE, Senior District Judge.
This matter is before me on Plaintiffs’ motion to exclude the testimony of Dr. Shirley Fry, as set forth in their Motion to Exclude the Testimonies of Fry, Grogan and Voilleque (Docket # 1728), filed December 4, 2005. Having carefully considered the motion with respect to Dr. Fry, the parties’ subsequent briefing on this subject, the relevant record and all applicable legal authorities, and being fully advised in the premises, I rule as follows:
Defendants offer Dr. Fry in rebuttal to the testimony of Plaintiffs’ expert Dr. Steven Wing. In compliance with Federal Rule of Civil Procedure 26 and the deadlines for expert disclosure I ordered in this case, Plaintiffs designated Dr. Wing as an expert in this matter in May, 1995, and provided his expert report to Defendants in November, 1996. Pursuant to Rule 26(a)(2)(C), Defendants were required to identify and provide an expert report for any expert evidence they intended to present to contradict or rebut Dr. Wing’s expert testimony within 30 days of Plaintiffs’ disclosure of Dr. Wing’s expert report. Fed.R.Civ.P. 26(a)(2)(C); see, e.g., Eckelkamp v. Beste, 315 F.3d 863, 872 (8th Cir.2002); Finley v. Marathon Oil Co., 75 F.3d 1225, 1230 (7th Cir.1996) (Posner, J.); Complaint of Kreta Shipping, S.A., 181 F.R.D. 273, 276 (S.D.N.Y.1998). Defendants did not disclose an expert to rebut Dr. Wing’s expert testimony in December, 1996, as required, and did not request any extension of time to do so. Instead, on October 7, 2005, at the start of trial and immediately after I denied Defendants’ Daubert motion to exclude Dr. Wing’s testimony, Defendants for the first time declared their intent to call Dr. Fry as a rebuttal witness to Dr. Wing. Defendants had not identified Dr. Fry as a [600]*600potential witness, expert or otherwise, on any of their previous witness lists.1
Rule 37(c)(1) provides that a party who without substantial justification fails to disclose information required by Rule 26(a) may not present this information as evidence at trial. This sanction is mandatory unless the non-disclosing party shows substantial justification or that the failure to disclose was harmless. See, e.g., Fed.R.Civ.P. 37(c)(1) (Adv. Comm. Note 1993); see Jacobsen v. Deseret Book Co., 287 F.3d 936, 952-53 (10th Cir.2002).2 This rule applies to rebuttal expert testimony that was not disclosed in compliance with Rule 26(a). See, e.g., Finley, 75 F.3d at 1230 (affirming exclusion of rebuttal evidence presented by expert witness because the evidence was not disclosed as required by Rule 26(a)); Congressional Air, Ltd. v. Beech Aircraft Corp., 176 F.R.D. 513, 515-16 (D.Md.1997) (same). Accordingly, unless Defendants had substantial justification for failing to disclose Dr. Fry’s testimony in December, 1996, she may not testify as a expert in rebuttal to Dr. Wing’s properly disclosed expert testimony.3
The only justification offered by Defendants for their failure to disclose Dr. Fry is that Plaintiffs’ inadvertent omission of Dr. Wing from their December, 2003 preliminary witness list led them to believe Dr. Wing would not testify at trial. Any confusion on this score was temporary, however, as Plaintiffs notified Defendants in July, 2004, more than a year before trial, that Dr. Wing was still a potential expert witness in this case. More importantly, Plaintiffs’ final decision on whether to call Dr. Wing at trial has nothing to do with the timing of Defendants’ obligation under the Federal Rules to provide disclosure of any expert testimony in rebuttal to Dr. Wing’s testimony. That obligation was triggered in November, 1996 when Plaintiffs disclosed Dr. Wing’s intended expert testimony, and required Defendants to disclose any expert evidence to contradict or rebut Dr. Wing’s expert testimony 30 days later, in December, 1996.4
Defendants argue I ruled that Dr. Fry could testify in rebuttal to Dr. Wing based on statements I made on October 7, 2005, immediately after Defendants for the first time stated their intent to call Dr. Fry as a rebuttal witness. Plaintiffs had had no discovery at that time regarding Dr. Fry and the scope of her intended testimony. Although Dr. Fry has not submitted an expert report, she was deposed by Plaintiffs on December 7. I now make my final ruling based on this more complete record.
Under this record, I hold that Dr. Fry may not present expert testimony in this case, in rebuttal to Dr. Wing or otherwise, because Defendants failed to comply with the expert disclosure requirements set out above and that failure was not substantially justified or harmless.
[601]*601That brings me to Defendants’ final argument, which is that Dr. Fry’s intended rebuttal testimony is not expert testimony at all and thus is not subject to these disclosure requirements, or, for that matter, the reliability requirements for expert testimony set forth in Fed.R.Evid. 702. Defendants assert this is so because Dr. Fry has personal knowledge of Dr. Wing and “of the field of epidemiology at DOE” as a result of her years of experience as a DOE epidemiologist. See Defs.’ Resp. (Docket # 1745) at 4; Defs.’ Resp. to Pis.’ Supp. (Docket # 1823) at 2. As a consequence, Defendants argue, Dr. Fry “can factually testify as to the work with which she is familiar” at DOE as a lay witness under Fed.R.Evid. 701. See Defs’ Resp. (# 1745) at 4.
Defendants assert they will question Dr. Fry regarding two specific areas of which she has personal knowledge: (1) “attempts to influence or limit epidemiological studies of workers at DOE nuclear facilities, including [Dr. Wing’s] own mortality study of Oak Ridge workers; and (2) the structure of the DOE radiation epidemiology program and the studies conducted under that program.” Defs’ Resp. to Pis’ Supp. (Docket # 1823) at 1. Defendants have stated that Dr. Fry’s testimony on these subjects is intended to rebut Dr. Wing’s testimony suggesting “that the DOE epidemiological studies were not credible, were inadequate and that the DOE’s purported ‘conflict of interest’ affected that science.” Defs’ Resp. (Docket # 1745) at 4.
An expert witness is “a witness qualified as an expert by knowledge, skill, experience, training or education” whose “scientific, technical or other specialized knowledge will assist the trier of fact to understand the evidence or to determine a fact in issue.” Fed. R.Evid. 702. By definition, therefore, an expert witness has personal knowledge of their field and of the matters on which they are to testify, or they would not be qualified to testify as an expert. As a result, that Dr. Fry has personal knowledge of the subjects on which she is to testify is not determinative of whether she is testifying as a lay fact witness or as an expert witness.5
The Federal Rules of Evidence require that a witness’ testimony be scrutinized under the rules regulating expert testimony to the extent that the witness is providing testimony based on scientific, technical, or other specialized knowledge within the scope of Rule 702. Fed.R.Evid. 701 Adv. Comm. Notes (2000 Am.). This requirement is to ensure “that a party will not evade the expert witness disclosure requirements set forth in Fed.R.Civ.P. 26 ... by simply calling an expert witness in the guise of a layperson.” Id.
“The distinction between lay and expert witness testimony is that lay testimony results from a process of reasoning familiar in everyday life, while expert testimony results from a process of reasoning which can be mastered only by specialists in the field.” Fed.R.Evid. 702 Adv. Comm. Notes (2000 Am.). The Tenth Circuit has stated this test as follows:
When the subject matter of proffered testimony constitutes “scientific, technical, or other specialized knowledge,” the witness must be qualified as an expert under Rule 702. Rule 701 applies only if the witness is not testifying as an expert. Indeed, the rule expressly prohibits the admission of testimony as lay witness opinion if it is based on specialized knowledge. In other words, a person may testify as a lay witness only if his opinions or inferences do not require any specialized knowledge and could be reached by any ordinary person.
Lifewise Master Funding v. Telebank, 374 F.3d 917, 929 (10th Cir.2004) (internal quotations and citations omitted).
There can be no question that Dr. Fry’s intended testimony would be based on her knowledge and alleged expertise in epidemiology 6 and thus on scientific, technical and [602]*602specialized knowledge, rather than knowledge or a process of reasoning familiar to the layman in everyday life. The subjects on which Defendants intend to question her require this specialized knowledge, and any opinions she might express on the identified subjects would be based on it. This conclusion is confirmed by my review of the examples of Dr. Fry’s intended testimony set forth by Defendants in their December 9 response.7 See Defs.’ Resp. (Docket # 1777) at 3-4.
Accordingly, I find Defendants are offering Dr. Fry as an expert witness, without having disclosed her and her testimony as required by Fed.R.Civ.P. 26(a). This failure to disclose was not substantially justified and is not harmless. Plaintiffs’ motion to exclude Dr. Fry’s testimony is, therefore, granted.
IT IS SO ORDERED.