He was a deputy district attorney of Alameda County, California from 1915 to 1920, and was in private practice in Oakland from 1920 to 1947.
[1] Hamlin was nominated by President Dwight D. Eisenhower on July 23, 1953, to a seat on the United States District Court for the Northern District of California vacated by Judge Monroe Mark Friedman.
His service terminated on April 15, 1958, due to his elevation to the Ninth Circuit.
[1] Hamlin was nominated by President Eisenhower on March 6, 1958, to a seat on the United States Court of Appeals for the Ninth Circuit vacated by Judge William Denman.
He was confirmed by the Senate on March 25, 1958, and received commission the next day.