I'm not related to McGeehan's but am just listing this bio information from some PA genealogy pages I had:
"McGEEHAN, Brice. b. 1761, d. June 22, 1826 (or 1825), in Beaver Township, Lawrence County, Pennsylvania. He served as a private in the Washington County, Pennsylvania, Militia. Burial was at the Bethel Cemetery. Beaver Township, Lawrence Co., Pennsylvania. Ref. V.A., N.S.S.A.R."