Jim Crawford received his B.S. in Mathematics from the United States Military Academy in 1986 and his Ph.D. in Atmospheric Chemistry from the Georgia Institute of Technology in 1997. Since that time, he has been a research scientist at NASA’s Langley Research Center. From the start of his graduate studies in 1991 and throughout his career, his research has been associated with airborne field studies conducted across the globe by NASA’s Tropospheric Chemistry Program and collaborating partners.

Paul Beukes is a full professor in chemistry at the North-West University (NWU), Potchefstroom, South Africa. He received his PhD (Chemistry) in 1999 from the then Pothefstroom University for CHE. Paul worked in the metallurgical industry for almost a decade after completing his PhD, holding various senior positions such a production manager and operations manager at large ferrochromium smelters. In late 2007 he returned to academia and is currently co-managing the Atmospheric Chemistry Research (ACRG) and Chromium Technology groups (CTG) at the NWU.