Edna Ernestine Kramer Lassar (May 11, 1902 - July 9, 1984), born Edna Ernestine Kramer, was an American mathematician and author of mathematics books.Kramer was born in Manhattan. She earned her B.A. summa cum laude in mathematics from Hunter College in 1922. While teaching at local high schools, she earned her M.A. in 1925 and Ph.D.