As credited by the
Minor Planet Center, he has discovered and co-discovered 32 numbered
asteroids at the
Bigelow Sky Survey during 1993–1999.[1] He has also discovered a number of comets including the long-period comet, C/1996 R1 (Hergenrother-Spahr), and three periodic comets,
168P/Hergenrother, 175P/Hergenrother and P/1999 V1 (Catalina). He is also a member of the science and operations team of the 2016-launched
OSIRIS-REx spacecraft, a sample return mission to study near-Earth asteroid
101955 Bennu.[2]