Dr. Uwe Arp is a physicist in the Ultraviolet Radiation Group of the Sensor Science Division in the Physical Measurement Laboratory. Before becoming employed by NIST in 2001, Dr. Arp was an employee of the University of Maryland from 1996 to 2001, while also having a guest researcher appointment at NIST. From 1993 to 1995 Dr. Arp received a Humboldt-fellowship to work in the group of Dr. Deslattes at NIST.