A native of Oakland, Gordon took his Bachelor's degree in economics at the University of California at Berkeley in 1942. After serving three years in the US Army, he enrolled at Northwestern University at Evanston, Illinois. In 1948 he received his Master's in Business Administration, while working for Horwath and Horwath, Certified Public Accountants, a firm specializing in hotels and restaurants. In 1948 Gordon returned to California to join Haskins and Sells, Certified Public Accountants (today, Deloitte and Touche).

He moved to Napa County in late 1949, opening the Calistoga office in January 1950, St. Helena later in the year, and the Napa office when his brother, Jerry, joined with him in 1953. Gordon has been managing partner of the firm, developing all of the internal operating systems toward the goals of quality, effeciency and excellence. He was greatly aided in 1975 when Dale Brown, James Tidgewell, and later, Robert Holder, joined the firm. G & J Seiberlich & Co LLP has developed into a broad-based accounting firm serving the industries of Napa County.

Gordon and his wife, Catherine have three children who are all successful in their own spheres. Gordon has retired effective June 1, 2001.