Carl Groos Jockusch Jr. (born July 13, 1941 in San Antonio, Texas) is an American mathematician. He graduated from Alamo Heights High School in 1959, attended Vanderbilt University in Nashville, Tennessee, and transferred to Swarthmore College, Pennsylvania in 1960, where he received his B.A. in 1963 with Highest Honors. He then enrolled at the Massachusetts Institute of Technology. He is a member of Phi Beta Kappa and Sigma Xi. In 2014, he became a Fellow of the American Mathematical Society. He is a professor emeritus at the University of Illinois at Urbana–Champaign.