About
Leadership
John Stevens
Chief Executive Officer
Mr. Stevens was named Chief Executive Officer in April 2021. Before taking his current position, he was Chief Operations Officer, beginning in August 2017. Prior to joining SES, Mr. Stevens was Senior Vice President of Technical Services and Regional Vice President at Clean Harbors Environmental Services from November 1991 to August 2017. He spent four years in the military as a captain in the U.S. Army. Mr. Stevens holds a Bachelor of Science degree from Marshall University.
Jeff Sweren
Chief Financial Officer
Mr. Sweren joined SES as Chief Financial Officer in August 2019. Prior to SES, Mr. Sweren spent 29 years in the environmental services industry in a variety of senior financial positions. Most recently, he was Controller at Liquid Environmental Solutions. From 2011 to 2016, Mr. Sweren held roles of increasing responsibility, including Chief Financial Officer of SWS Environmental Services. Prior, he served as Vice President of Finance and Group Controller at Clean Harbors Environmental Services. Mr. Sweren holds a Bachelor of Economics degree from Saint Mary’s College of Maryland.
Blake Brown II
Chief Operating Officer
Mr. Brown was named Chief Operating Officer in March 2024 after serving as Vice President of Industrial Services since 2021. Mr. Brown joined SES in 2019 in the role of Regional Operations Manager. Prior to joining SES, Mr. Brown spent nearly 16 years at HydroChemPSC, in roles of increasing responsibility, including Location Manager and Area Manager. Mr. Brown holds a Bachelor’s Degree in Business Administration and Management from Malone University.
