McCallister was chairman and CEO of WGL Holdings Inc. and Washington Gas until his retirement in 2018. Previously, he held various leadership positions with Southern Natural Gas and Atlantic Richfield Company. He currently serves on the Board of AltaGas Ltd.
- 2020 Fourth Quarter
Added to: Primoris Services Corporation - Dallas, TX
Primoris Services is a specialty contractor and infrastructure company. Revenues are $3 billion.