The 1930s represented an important time of transition for the NFL. League membership was fluid prior to the mid-1930s. In 1933, the Pittsburgh Steelers and Philadelphia Eagles were founded. 1936 was the first year where there were no franchise moves, prior to that year 51 teams had gone defunct. In 1941, the NFL named its first Commissioner, Elmer Layden. The new office replaced that of President. Layden held the job for five years, before being replaced by Philadelphia Eagles co-owner Bert Bell in 1946.