Dr. O Callahan is on Doximity
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Office
5 Shrewsbury St
Ste D
Holden, MA 01520Phone+1 508-829-3800Fax+1 508-829-3802
Education & Training
UMass Chan Medical SchoolResidency, Emergency Medicine, 1990 - 1993- University of Massachusetts Medical SchoolClass of 1990
Certifications & Licensure
MA State Medical License 1994 - 2025
HI State Medical License 1992 - 1996- American Board of Emergency Medicine Emergency Medicine
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