Mary Cohan (1909–1983), also known as Mary Cohan Ronkin, was an American Broadway composer and lyricist, and the middle daughter of vaudeville and Broadway entertainer George M. Cohan. George's mother's middle name was Mary, and it is believed that his daughter was named after her. (Mary's mother was named Agnes Mary Nolan.)
Following a brief career as a cabaret singer, Mary Cohan established herself as a Broadway talent in 1930, when she composed a score for her father's non-musical play The Tavern.
Working with writers John Pascal, Francine Pascal, and Michael Stewart, Mary Cohan supervised the musical and lyrical revisions of her father's songs for the hit 1968 Broadway musical, George M!.[1]