After the war ended, King decided to attend the School for American Crafts (SAC) at Alfred, New York in January of 1947. SAC was the first American professional school solely devoted to educating craftsmen and was founded by Aileen Osborne Webb, who married into the Vanderbilt family. The purpose of SAC was to raise the standards of handmade craft in the US to a professional level. The curriculum was intensely studio-centered with both students and faculty expected to work forty hours a week. King studied enameling and metalworking at SAC alongside some of the most accomplished American craftsmen of the time, including Mitzi Otten, Lauritz Christian Eichner, and John Prip. Prip was American-born but his father was Danish and Prip himself had lived in Denmark much of his life and studied metalworking there. He brought his considerable knowledge, skills, and interest in Danish Modernism to the school as teacher and head of the department. This was the type of modern design that also appealed to and inspired King. At SAC King would receive his fundamental professional preparation and education in the art and craft of metalworking. It was also at SAC that he was to meet his future wife, Carol Thomson, a ceramics student.
After King graduated from SAC in 1949, Van Koert offered him a job in the design department at Towle Silversmiths, where he was now head designer. King married Carol and together they moved to Newburyport, Massachusetts where King started to work as a silver designer with Van Koert as his boss. He asked King to design and make a prototype of a flatware set that would be biomorphic and sleek like the modern Scandinavian designs that were gaining attention in the international design community. King created a silver design called Contour in 1950, which would be the first American sterling pattern to demonstrate post-World War II organic modernist design. It was first introduced in Knife, Fork, and Spoon, which was a traveling exhibition co-sponsored in 1951 by Towle and the Walker Art Center in Minneapolis. Van Koert filed the company patent as the designer of Contour, but in actuality, it was King who designed and made the flatware prototype and subsequent matching holloware. Contour is aptly named. The design is biomorphic and highlights soft, graceful curves. Contour was different from other designs in that several features of the utensils were slightly smaller than in the past. Most radically, the flatware had no decoration. King said that his approach was to “evolve a form that is decorative in itself without having to apply decoration on top."
The Museum of Modern Art included Contour in its 1951 Good Design exhibition, which helped promote the design commercially. It was also the only production-line American flatware ever included in Good Design. A six-piece place setting, along with a serving spoon, cream ladle, tablespoon, and carving set, was selected by the judges. The Good Design exhibitions opened up opportunities to create modern designs no longer utilizing external decoration. King’s handmade work was exhibited in the American Pavilion at the Brussels World's Fair in 1958. King’s pieces that were shown were a silver buffet server and silver ladle, along with a six-piece setting of flatware.