Seymour Tomashoff was born on September 11, 1922, in New York City. He attended Curtis High School on Staten Island and New York's City College before being sent to the Engineering Officer Training Program at Carnegie Tech at the outset of World War II.
He eventually served as a rifleman under General George S. Patton and was awarded the Combat Infantryman Badge and a Bronze Star for valor.
Back home, Tomashoff received a bachelor's degree in architecture from Carnegie Tech in 1950, then landed a job as a scenic artist at ABC Studios in New York. In the '50s and '60s, he worked as an art director on such