Paul J. McGowan, who had a law practice in Washington from 1958 to 1996 and was also involved in lobbying work, died Feb. 22 at a daughter’s home in Chevy Chase. He was 80.

The cause was cancer, said his son Michael McGowan.

Mr. McGowan spent three years as chief legislative aide to Rep. Edward P. Boland (D-Mass.) before starting his legal practice. His clients included John Hancock life insurance and Gillette razors. He hosted an annual St. Patrick’s Day party at his home in Bethesda for members of Congress and congressional staffers.

Paul John McGowan Jr., a native of Springfield, Mass., was a 1955 graduate of the College of the Holy Cross in Worcester, Mass., and a 1958 graduate of Georgetown University law school.

He was a past member of Little Flower Parish in Bethesda and was a member of the Knights of Malta.

He moved to Ponte Vedra Beach, Fla., from Bethesda in 2005.

Survivors include his wife of 50 years, C. Maureen Gaine McGowan of Ponte Vedra Beach; six children, Michael McGowan and Brendan McGowan, both of Bethesda, Maura Gordy and Kate McGowan, both of Chevy Chase, Md., Ellen Katz of Dallas and Ann Redgate of Chicago; and 12 grandchildren.

— Adam Bernstein