Robert Edward Jager (b. 1939) was arranger/composer for the U.S. Navy at the Armed Forces School of Music from 1962 to 1965. In 1968 he graduated from the University of Michigan. He then went on to be the lecturer in composition and directing at Old Dominion University in Norfolk, Virginia. In 1971, he joined the faculty at Tennessee Tech University and remained there until his retirement as professor emeritus in 2001.
Jager has composed over 150 published works for band, orchestra, chorus, and various chamber combinations. Major ensembles that have commissioned his music include the Tokyo Kosei Wind Orchestra, the Republic of China Band Association, several large universities, and all five of the Washington-based military bands.
He has received numerous honors for his works, including the Roth Orchestra Award twice, and is the only three-time winner of the ABA Ostwald Award (1964, 1968, 1972). He won the 1964 Award for two movements from his Symphony for Band.
Jager's Diamond Variations is a set of five variations on the trio melody of the march Illinois Loyalty. The piece was written for the 75th anniversary of the University of Illinois Concert Band and won the 1968 ABA Ostwald Award.