After the war ended, he returned to East Tennessee and took over the family-owned welding shop. He owned 30% of the company with his two brothers, Jerome S. Glazer and Louis A. Glazer (owning 25% each) and his brother-in-law, I. B. Cohen (with a 20% share) as partners. In 1955, I.B Cohen sold his share back in Glazer Steel to the three brothers with Guilford's interest increasing to 38.12% and Jerome's and Louis's share becoming 30.94% each. Under his management, the business grew to become a major steel fabrication business, the Glazer Steel Corporation with production facilities in Knoxville and New Orleans. Glazer Steel fabricated bridges and other structures for Kaiser Aluminum, the government of France, and other customers around the world.