Manhattan District Attorney Cyrus R. Vance, Jr., today announced the convictions of GEORGE CASTRO, 50, WALTER STEPHENS, JR, 66, and JEREMY DIEUDONNE, 47, for defrauding Columbia University out of approximately $5.7 million and transferring the funds into accounts for their own use. JOSEPH PINERAS, 35, was found guilty of fraud through his access to Columbia’s vendor payment system.