Chief software designer for the world's first transistorized computer, the Philco TRANSAC S-2000, Rosen left a significant mark on early computing history.
Born in Port Chester, NY, Rosen was elected to Phi Beta Kappa and graduated from the City College of New York in 1941 with a BS in mathematics. He received an MS in mathematics from the University of Cincinnati in 1942, and then served in the Army Signal Corps in Europe until 1946. After the war, he attended the University of Pennsylvania, where Rosen earned the PhD in mathematics in 1950.
He was an instructor of mathematics at the University of Delaware (1946–47), lecturer at the University of California, Los Angeles (1948–49), assistant professor at Drexel University (1949–51), assistant professor at the University of Pennsylvania (1952–54), and associate professor in the Computational Laboratory at Wayne State University (1954–56).
