 Wicker was a professor at Texas A&M University (TAMU) from 1992-1999.In 1999 he joined the National Severe Storms Laboratory (NSSL) as a research meteorologist and is a Fellow of the Cooperative Institute for Mesoscale Meteorological Studies (CIMMS).At NSSL/CIMMS, he is an affiliate associate professor in the School of Meteorology at OU.