Gregory J. Callahan is a Other Technician based in Baltimore, MD. Gregory J. Callahan practices in Baltimore, MD and has the professional credentials of BOCO. The NPI Number for Gregory J. Callahan is 1497944946 and holds a License No. C21679 (Maryland).

The current practice location address for Gregory J. Callahan is 3900 Loch Raven Blvd, Baltimore, MD and can be reached out via phone at 410-605-7000 and via fax at 410-605-7677. You can also correspond with Gregory J. Callahan through the mailing address at 3900 LOCH RAVEN BLVD, BALTIMORE, MD - 21218-2108 (mailing address contact number: 410-605-7000).