Scott D. Sheffield began his career in 1975 with Amoco Production as a reservoir engineer before becoming the fifth employee of Parker & Parsley Petroleum in 1979, based in Midland, Texas. He worked his way up to CEO of Parker & Parsley and became chairman in 1991. Parker & Parsley merged with MESA in 1997 to form Pioneer. He retired from Pioneer in 2016 and returned as CEO in 2019.
Mr. Sheffield attend high school in Tehran.