FLAHERTY, Judge.
Employer NGK Metals Corporation (NGK) and its workers’ compensation insurance carrier, Tokio Marine and Fire Insurance Company (Tokio), were granted reconsideration of their cross-appeals and the appeal of Ronald Bochis (Claimant) from the decision of Commonwealth Court, which affirmed in part and reversed and remanded the April 18, 1996, decision and order of the Workers’ Compensation Appeal Board (Board)1. The Board reversed the award of the healing period by the worker’s compensation judge (WCJ), but affirmed the WCJ’s decision in all other aspects. We reverse.
Claimant worked in a metals plant which NGK purchased on October 1, 1986 (1986) when Tokio was NGK’s insurance carrier. NGK changed carriers, effective January 1, 1993, to National Union. In June of 1993,-prior to the filing of his Petition, Claimant was advised by his physician that Claimant sustained a work-related complete loss of the use of his hearing. On June 16,1993, Claimant filed a claim petition (Petition) averring a complete loss of the use of his hearing which was incurred while working for NGK.
At a hearing before the WCJ, Claimant and a lay witness testified regarding the noise level. Claimant also testified as to dates exposed, amount of exposure and hearing difficulty. Medical testimony was presented in support of Claimant’s Petition. NGK presented testimony from its plant production manager concerning its takeover of the plant in 1986 and testimony by medical experts regarding Claimant’s hearing loss.
After a hearing, the WCJ found that Claimant, while working for NGK, sustained a specific loss of the use of his hearing in both ears for all practical intents and purposes. In a decision rendered January 31, 1995, the WCJ awarded Claimant 260 weeks of compensation for binaural hearing loss under Section 306(e)(8)(I) of the Act, 77 P.S. § 513(8)(i), along with a 10 week healing period provided under Section 306(c)(25) of the Act, 77 P.S. § 513(25).
On April 18, 1996, the Board reversed the award of the healing period, specifically finding that Claimant never returned to employment and, in fact, left employment prior to his medical expert’s diagnosis of his condition.2 The Board determined there was no need for a healing period as the record lacked any evidence that Claimant ever intended to return to work. The Board, however, affirmed the WCJ’s decision in all other aspects. Claimant appealed and NGK and Tokio cross-appealed from the Board’s decision and order. This Court initially reversed [129]*129the Board as to the healing period but affirmed the Board otherwise. NGK and Tok-io then filed an application for reargument which this Court denied while granting reconsideration which is now before us.3
Petitioner NGK raises the following issues on cross-appeal and reconsideration: whether substantial evidence exists to prove injurious exposure to noise levels after Claimant beeame a janitor so as to establish causation of the injury while in the employ of NGK; if causation is established, whether Tokio is the responsible carrier, whether Claimant proved timely notice of injury and whether the WCJ erred in relying upon the testimony opinion of Claimant’s medical expert. Claimant raises the issue of whether the Board erred in reversing the healing period awarded to Claimant.4
The WCJ is the ultimate finder of fact, School District of Philadelphia v. Workers’ Compensation Appeal Bd. (London), 707 A.2d 1176 (Pa.Cmwlth.1998), and the exclusive arbiter of credibility and evidentiary weight. Greenwich Collieries v. Workmen's Compensation Appeal Board (Buck), 664 A.2d 703 (Pa.Cmwlth.1995).
Because the WCJ has complete fact-finding discretion as to the credibility of witnesses and evidentiary weight, such findings will not be disturbed if supported by substantial evidence. Harding v. Workers’ Compensation Appeal Bd. (Arrowhead Industrial and ITT Hartford), 706 A.2d 896 (Pa. Cmwlth.1998). Substantial evidence- has been defined as “such relevant evidence that a reasonable mind might accept as adequate to support a conclusion.” Jordan v. Workmen’s Compensation Appeal Bd. (Consolidated Elec. Distribs.), 550 Pa. 232, 704 A.2d 1063 (1997). Therefore, the WCJ is free to accept or reject, in whole or in part, the testimony of any witness presented including that of medical experts. Buczynski v. Workmen’s Compensation Appeal Board (Richardson-Vicks, Inc.), 133 Pa.Cmwlth. 532, 576 A.2d 421 (1990).
As we stated in Sellari v. Workmen’s Compensation Appeal Board (NGK Metals Carp.), 698 A.2d 1372, 1376 (Pa.Cmwlth. 1997), “Our review, specifically regarding witness testimony, is simply to ensure that the WCJ’s findings of fact have the requisite measure of support in the record.”
As part of a claimant’s burden of establishing the initial right to compensation, he must allege and prove all the elements necessary to support an award, including the existence of an employer-employee relationship at the time of injury. Williams v. Workmen’s Compensation Appeal Board (Global Van Lines), 682 A.2d 23 (Pa.Cmwlth. 1996). Claimant has the burden of proving that his or her injury occurred in the course of employment and was related to that employment. Cox v. Workmen’s Compensation Appeal Board (Brookville Glove Mfg.), 144 Pa.Cmwlth. 147, 601 A.2d 404 (1991).
When an employee has ceased working, the date that must be used to determine the date of injury from which calculations for benefits for specific loss of the use of his hearing are made is the date of last exposure, since that is the day when Claimant was last exposed to the harm that caused the injury. Sellari at 698 A2d 1372. “As this court held in Pittsburgh Press Co. v. Workmen’s Compensation Appeal Board (Taress), 143 Pa.Cmwlth. 609, 600 A2d 626 (1991), ‘... it is the last employer under which a claimant is cumulatively exposed to loud noise that is the responsible party.’ ” Id.
EVIDENCE AND CREDIBILITY
Claimant testified on direct examination that he started working in 1951 at a number of very noisy jobs in the plant for Employer and its predecessors until he had a knee replacement and was transferred to a janitor’s job in the administrative offices in 1987. [130]*130(R.R. 987-990.) While in his job as a janitor, he did not go back into the plant and had no noise exposure. On cross-examination, however, Claimant admitted he did not know or remember when he started working as a janitor, whether in 1985 or 1987.5
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FLAHERTY, Judge.
Employer NGK Metals Corporation (NGK) and its workers’ compensation insurance carrier, Tokio Marine and Fire Insurance Company (Tokio), were granted reconsideration of their cross-appeals and the appeal of Ronald Bochis (Claimant) from the decision of Commonwealth Court, which affirmed in part and reversed and remanded the April 18, 1996, decision and order of the Workers’ Compensation Appeal Board (Board)1. The Board reversed the award of the healing period by the worker’s compensation judge (WCJ), but affirmed the WCJ’s decision in all other aspects. We reverse.
Claimant worked in a metals plant which NGK purchased on October 1, 1986 (1986) when Tokio was NGK’s insurance carrier. NGK changed carriers, effective January 1, 1993, to National Union. In June of 1993,-prior to the filing of his Petition, Claimant was advised by his physician that Claimant sustained a work-related complete loss of the use of his hearing. On June 16,1993, Claimant filed a claim petition (Petition) averring a complete loss of the use of his hearing which was incurred while working for NGK.
At a hearing before the WCJ, Claimant and a lay witness testified regarding the noise level. Claimant also testified as to dates exposed, amount of exposure and hearing difficulty. Medical testimony was presented in support of Claimant’s Petition. NGK presented testimony from its plant production manager concerning its takeover of the plant in 1986 and testimony by medical experts regarding Claimant’s hearing loss.
After a hearing, the WCJ found that Claimant, while working for NGK, sustained a specific loss of the use of his hearing in both ears for all practical intents and purposes. In a decision rendered January 31, 1995, the WCJ awarded Claimant 260 weeks of compensation for binaural hearing loss under Section 306(e)(8)(I) of the Act, 77 P.S. § 513(8)(i), along with a 10 week healing period provided under Section 306(c)(25) of the Act, 77 P.S. § 513(25).
On April 18, 1996, the Board reversed the award of the healing period, specifically finding that Claimant never returned to employment and, in fact, left employment prior to his medical expert’s diagnosis of his condition.2 The Board determined there was no need for a healing period as the record lacked any evidence that Claimant ever intended to return to work. The Board, however, affirmed the WCJ’s decision in all other aspects. Claimant appealed and NGK and Tokio cross-appealed from the Board’s decision and order. This Court initially reversed [129]*129the Board as to the healing period but affirmed the Board otherwise. NGK and Tok-io then filed an application for reargument which this Court denied while granting reconsideration which is now before us.3
Petitioner NGK raises the following issues on cross-appeal and reconsideration: whether substantial evidence exists to prove injurious exposure to noise levels after Claimant beeame a janitor so as to establish causation of the injury while in the employ of NGK; if causation is established, whether Tokio is the responsible carrier, whether Claimant proved timely notice of injury and whether the WCJ erred in relying upon the testimony opinion of Claimant’s medical expert. Claimant raises the issue of whether the Board erred in reversing the healing period awarded to Claimant.4
The WCJ is the ultimate finder of fact, School District of Philadelphia v. Workers’ Compensation Appeal Bd. (London), 707 A.2d 1176 (Pa.Cmwlth.1998), and the exclusive arbiter of credibility and evidentiary weight. Greenwich Collieries v. Workmen's Compensation Appeal Board (Buck), 664 A.2d 703 (Pa.Cmwlth.1995).
Because the WCJ has complete fact-finding discretion as to the credibility of witnesses and evidentiary weight, such findings will not be disturbed if supported by substantial evidence. Harding v. Workers’ Compensation Appeal Bd. (Arrowhead Industrial and ITT Hartford), 706 A.2d 896 (Pa. Cmwlth.1998). Substantial evidence- has been defined as “such relevant evidence that a reasonable mind might accept as adequate to support a conclusion.” Jordan v. Workmen’s Compensation Appeal Bd. (Consolidated Elec. Distribs.), 550 Pa. 232, 704 A.2d 1063 (1997). Therefore, the WCJ is free to accept or reject, in whole or in part, the testimony of any witness presented including that of medical experts. Buczynski v. Workmen’s Compensation Appeal Board (Richardson-Vicks, Inc.), 133 Pa.Cmwlth. 532, 576 A.2d 421 (1990).
As we stated in Sellari v. Workmen’s Compensation Appeal Board (NGK Metals Carp.), 698 A.2d 1372, 1376 (Pa.Cmwlth. 1997), “Our review, specifically regarding witness testimony, is simply to ensure that the WCJ’s findings of fact have the requisite measure of support in the record.”
As part of a claimant’s burden of establishing the initial right to compensation, he must allege and prove all the elements necessary to support an award, including the existence of an employer-employee relationship at the time of injury. Williams v. Workmen’s Compensation Appeal Board (Global Van Lines), 682 A.2d 23 (Pa.Cmwlth. 1996). Claimant has the burden of proving that his or her injury occurred in the course of employment and was related to that employment. Cox v. Workmen’s Compensation Appeal Board (Brookville Glove Mfg.), 144 Pa.Cmwlth. 147, 601 A.2d 404 (1991).
When an employee has ceased working, the date that must be used to determine the date of injury from which calculations for benefits for specific loss of the use of his hearing are made is the date of last exposure, since that is the day when Claimant was last exposed to the harm that caused the injury. Sellari at 698 A2d 1372. “As this court held in Pittsburgh Press Co. v. Workmen’s Compensation Appeal Board (Taress), 143 Pa.Cmwlth. 609, 600 A2d 626 (1991), ‘... it is the last employer under which a claimant is cumulatively exposed to loud noise that is the responsible party.’ ” Id.
EVIDENCE AND CREDIBILITY
Claimant testified on direct examination that he started working in 1951 at a number of very noisy jobs in the plant for Employer and its predecessors until he had a knee replacement and was transferred to a janitor’s job in the administrative offices in 1987. [130]*130(R.R. 987-990.) While in his job as a janitor, he did not go back into the plant and had no noise exposure. On cross-examination, however, Claimant admitted he did not know or remember when he started working as a janitor, whether in 1985 or 1987.5 Claimant introduced no evidence other than his own testimony concerning whether he began working as a janitor before or after NGK purchased the plant. NGK presented no admissible evidence as to Claimant’s starting date as a janitor. The WCJ found Claimant’s testimony to be credible (F.F. No. 8.) and also:
17. After review of the record, this judge finds as a fact that Claimant was exposed to loud and damaging noises during his employment with defendant and its predecessor corporations.
(Finding of Fact No. 17.)
The WCJ found the testimony of Claimant’s medical expert credible and persuasive that the hearing loss was due to work-related noise exposure.
In 1986, NGK purchased the facility where Claimant had been working (and other facilities) from Kawecki Berylco Industries, Inc. Even though NGK had shut down other plants and departments, NGK continued operating certain parts of the Kawecki facilities with some of the same employees. NGK, however, is a completely different company.6
NGK argues that there is not substantial evidence to support the finding that Claimant was exposed to noise after NGK purchased the plant. If Claimant became a janitor in •1985, as NGK contends, Claimant was not exposed to noise while working as a janitor after 1986, and, thus, was not exposed to any noise while in the employ of NGK. (R.R. 990, 991, 1001.) On the other hand, if Claimant started working as a janitor in 1987, he would then have been exposed to high noise levels after 1986 while in the employ of NGK, as alleged in his Petition. Such exposure after 1986 would make NGK the last employer when Claimant was last exposed to loud, occupational noise.
It is undisputed that NGK did not purchase the plant until 1986 and that Claimant was not exposed to any noise after he became a janitor. There must, therefore, be substantial evidence that Claimant was exposed to injurious noise after 1986 to support a finding that he was injured while employed by NGK. The beginning date of the janitori[131]*131al job is, therefore, material to proving that the injury occurred while in the employ of NGK.
In the case sub judice, Claimant originally responded, on direct examination and on cross-examination, in the affirmative to questions suggesting that 1987 was the year he started the janitor’s job. Thereafter, however, on cross-examination, he clearly admitted at least six times that he did not know or remember in what year he started the janitorial job which fixes the date of last exposure and relates it to the purchase of the plant by NGK in 1986.
Claimant alleged in his Petition that NGK was his employer at the time of his injury. In his testimony, however, Claimant repeatedly stated that he does not know or remember the date he started his janitorial position, which date ended his last exposure and would determine by whom he was employed on the date of last exposure. There is no other evidence of that critical date other than Claimant’s original affirmation of the 1987 date which he subsequently recanted on cross-examination. In summary, Claimant’s recanted testimony is at best equivocal and fails to establish that he was exposed to injurious noise after NGK became his employer.
Here, Claimant equivocated on the proof of a material allegation by making contradictory statements which did not establish the identification of his employer at the time of Claimant’s last exposure to injurious noise. The WCJ did not make a finding or even indicate any awareness of the importance of the date Claimant started the janitor’s job.
Therefore, Claimant has not sustained his burden of proving a fact alleged which is material to his claim, to wit: that NGK was his employer at the time he was last exposed to noise of an injurious nature. Consequently, because the probata varies from the allegata, there is not substantial evidence to support a finding that NGK was Claimant’s employer when he was last exposed to injurious noise. Since none of Claimant’s employers previous to NGK were alleged as liable employers in Claimant’s Petition, the Petition must fail.
Thus, the Board erred when it affirmed the WCJ’s finding that Claimant sustained a work-related specific loss of the use of his hearing while in the course of his employment with NGK.
Accordingly, there is no need to review the other issues raised by the parties as we reverse the Board’s decision that Claimant is entitled to specific loss of use of hearing benefits.
ORDER
NOW, April 16, 1998, the April 18, 1996, order of the Workers’ Compensation Appeal Board is reversed.