Aug 2020 to Present               Associate Professor, Department of Earth and Environment, Florida International University, Miami, FL.

Sept 2017 to Aug 2020           Associate Professor, Department of Environmental and Interdisciplinary Sciences, Texas Southern University, Houston, TX.

Sept 2018 to June 2019          Fulbright Scholar -Sub-Saharan Africa, Department of Geomatics and Land Management, Makerere University, Kampala, Uganda.

Sept 2011 to Aug 2017           Assistant Professor, Department of Environmental and Interdisciplinary Sciences, Texas Southern University, Houston, TX.

Sept 2014 to Present               Director, Environmental Toxicology Program, Department of Environmental and Interdisciplinary Sciences, Texas Southern University, Houston, TX.

June 2013 to Aug 2016           Visiting Summer Faculty, Oak Ridge National Lab (ORNL), Oak Ridge, TN.

July 2009 to Sept 2011           Research Scientist, Department of Geology, Bowling Green State University, Bowling Green, OH.

July 2004 to June 2009           Postdoctoral faculty, Department of Geology, Bowling Green State University, Bowling Green, OH.