Cowan Pottery Studio mainly produced architectural tiles, but also created a line of bowls and vases called "Lakewood Ware.
Upon returning home after the war in 1920, Cowan decided to move his pottery studio to 19633 Lake Road in Rocky River, Ohio.
Cowan hired a small staff number of well-known Cleveland School artists and by the mid-1920s a number of established artists came to work in his studio: Elizabeth Anderson, Arthur Eugene Baggs, Alexander Blazys, Paul Bogatay, Edris Eckhardt, Waylande Gregory, A. Drexler Jacobson, Raoul Josset, Paul Manship, José Martin, Herman Matzen, F. Luis Mora, Elmer L. Novotny, Margaret Postgate, Stephen Rebeck, Guy L. Rixford, Viktor Schreckengost, Elsa Vick Shaw, Walter Sinz, Frank N. Wilcox, H. Edward Winter, and Thelma Frazier Winter.
[2] Some of Cowan's students were not trained in ceramics prior to starting in his studio and had to be taught how to work with their hands.
For the last two, Gregory made sketches from the side of the stage of the well-known Ziegfeld Follies star, Gilda Grey, when she was performing in Cleveland.