Max Showalter (June 2, 1917 – July 30, 2000) was an American film, television, and stage actor, as well as a composer, pianist, and singer. One of Showalter's most memorable roles was as Jean Peters' character's husband in the 1953 film Niagara. Showalter is also credited as Casey Adams.
Born in Caldwell, Kansas, Showalter developed a desire for acting as a toddler while accompanying his mother to local theatres where she played piano for silent movies. By the late 1930s, he had multiple stage roles under his belt, and soon made his Broadway debut in Knights of Song. Showalter also appeared in the traveling musical This Is the Army for two years and in other notable Broadway productions like Make Mine Manhattan and The Grass Harp. His most memorable stage role was as Horace Vandergelder in the Broadway hit show, Hello Dolly!. Showalter performed the role more than 3,000 times opposite Carol Channing, Betty Grable and Ginger Rogers.
In the late 1940s, Showalter was signed to 20th Century Fox as a featured contract player. His name was changed by Fox's founder, Darryl F. Zanuck to the more "bankable" Casey Adams. He made his feature film debut in 1949's Always Leave Them Laughing. The same year, he first appeared on television in the short-lived musical variety series The Lanny Ross Show (also known as The Swift Show). His second feature film was the 1952 biographical film With a Song in My Heart, where he had a small role as a vaudeville performer. In the film, Showalter, along with David Wayne, sang the song "Hoe that Corn", which he also wrote. The following year, he appeared in Niagara alongside Marilyn Monroe.