Kevin F. O'Marah, 65, a Falls Church resident since 1989 and founder and principal of a Boston-based architectural firm, died July 19 at a hospital in Boston after a stroke.

A licensed architect in 45 states, Mr. O'Marah spent most of his 30-year career in Boston, where he recently traveled to attend a family function.

In 1976 there, he started the firm Rose, Grunnigen & O'Marah, which covered a wide range of architectural building types, including the design and construction of more than 65 athletic facilities.

He opened the firm's Falls Church office in 1989 and counted among his projects the major expansion of the Studio Theatre in Washington.

He was born in Buffalo and was raised there and in Tokyo. He graduated and received a master's degree in architecture from Harvard University. During and briefly after graduate school, he worked for the Washington architectural firm of Cohen & Haft.

Survivors include his wife, Sheila O'Marah of Falls Church; three children, Kevin E. O'Marah of Dedham, Mass., Eamon Casey O'Marah of Dover, Mass., and Meave Gately O'Marah of West Roxbury, Mass.; two sisters, Maureen O'Brien of Reston and Diane Higgins of Washington; and three grandchildren.