Gene Robertson started shooting trap in 1935 at the Union Pacific Gun Club in Los Angeles. The following year, he won his first of five consecutive state junior singles championships. During those years, he earned additional trophies.

In 1938, Gene was runner up in the Handicap Championship, and two years later, he captured the doubles and all-around titles, placed third among all shooters in the main singles, and took home his last ATA junior crown.

Gene was runner up in the title doubles in 1941. The following year, he ended second in the main singles and annexed the handicap and all-around titles. In 1943, he earned another doubles crown, and he repeated as twin-bird champion in 1946. (There were no state shoots in 1944 and 1945) That latter year he won the first of two consecutive doubles and all-around championships. He paced high-over-all scoring in 1947, and he was runner up in the all-around in 1949.

During this same period, Gene was winning numerous PITA trophies as well. In 1937 and 1938, he was sub-junior high in the World Championships, and he was junior leader in state competition in 1938 and 1939. In 1940, he topped juniors at the World Championships, and he also finished as runner up in the main doubles there.

Gene captured the singles and doubles along with the junior championships during the 1941 PITA state meet, and he led the doubles and all-around again in 1942. In 1960, Gene won the PITA Grand doubles title with 99.

Gene and son Ken totaled 396X400 in 1962 to capture the Parent and Child Championship at the ATA Grand American. Gene also won the 1988 and 1989 state Veteran titles in singles.

Scott, son of the late Ken Robertson, introduced his grandfather and recognized Gene's accomplishments during the induction.

Gene Robertson was inducted in to the California Trapshooting Hall of Fame in 1990.