On November 16, 2015, Summit Midstream Partners, LLC announced that its board of directors had appointed Leonard Mallett as executive vice president and chief operations officer of the company and Summit Midstream GP, LLC (the general partner), which manages and operates Summit Midstream Partners, LP. This appointment is effective December 1, 2015. Mr. Mallet joins the company from Enterprise Products Partners, L.P (EPD), where he most recently served as senior vice president of engineering.

Prior to that, Mallett served as EPD's senior vice president in charge of environmental, health and safety. Mr. Mallett began his career with Teppco and has over 25 years of oil and gas industry experience in various engineering, transportation, and operations roles with Teppco and its successor entities.