Alexander Gibson Porter was born in Allegany County, Maryland October 10, 1902. Porter attended the Gilman School for Boys and obtained his BA and MFA in Architecture from Princeton University in 1925 and 1927. His first professional positions were with the Chicago firm of E.H. Clark in Illinois and in Florida. In 1930, he returned to Maryland and worked at various times for the architecture firms of Henry Powell Hopkins; Buckler, Fenhagen, Meyer & Ayres; and Fisher, Nes, Campbell & Associates. In 1932, he became a partner in the Engineering Construction Company. Porter started his solo practice as architect of Golsborough Hall, a mansion on Kent Island in Queen Anne’s County, Maryland.