Career
He is a prolific discoverer of asteroids. He is credited by the Minor Planet Center with the discovery or co-discovery (with Charles West Juels) of about 200 asteroids between 1998 and 2003. Holvorcem with Juels also discovered two comets: C/2002 Y1 (Juels-Holvorcem) and C/2005 Non-attached (Juels-Holvorcem).
Holvorcem was also involved in the discovery of C/2011 K1 (Schwartz-Holvorcem).
The asteroid (13421) Holvorcem was named after him.
