EnCap Flatrock Midstream Promotes Matthew Melton, Kyle Stelma to Vice President EnCap Flatrock Midstream recently announced the promotions of Matthew R. Melton and Kyle Stelma, who both joined the San Antonio-based firm in 2017, to vice president. Hart Energy Staff Your browser does not support the audio element. EnCap Flatrock Midstream recently announced the promotions of Matthew R. Melton and Kyle Stelma, who both joined the San Antonio-based firm in 2017, to vice president. Matthew R. Melton “Since they joined EnCap Flatrock in 2017, Matt and Kyle have each demonstrated a strong work ethic and a deep understanding of our business model and goals,” EnCap Flatrock Midstream Managing Partner and Founder Bill Waldrip said in a statement on Jan. 5. “They are very capable leaders with strong financial skill sets and a proven commitment to helping our portfolio companies succeed. We are excited to watch them continue to grow as they take on increased responsibilities.”