
Sean Guillroy, Former President of Shell Midstream US, Joins Flacks Group as Chief Investment Officer, Energy
Sean Guillroy, former President of Shell Midstream US, joins Flacks Group as Chief Investment Officer, Energy, effective September 1, 2026. Sean brings 22 years of experience at Shell and extensive leadership experience across the energy and infrastructure sectors. At Shell Midstream US, he led a 470+ member organization across 12







