DENVER, Colorado — Johns Manville (JM), a leading manufacturer of premium-quality building and specialty products, today announced a significant leadership transition within its insulation systems business. Greg Clarke, president of insulation systems, will retire in late January after an accomplished career spanning decades with Johns Manville. Clarke has been a trusted business leader and an integral member of JM’s executive team. Since assuming the role in 2020, he has driven strong performance and growth for insulation systems. Previously, Clarke served as JM’s chief financial officer beginning in 2013 and held leadership roles from 1997 to 2002 as vice president and general manager of both the building insulation and commercial & industrial insulation divisions. 

“Greg has played a key role in JM’s success, consistently strengthening relationships with our customers and providing thoughtful leadership across the organization,” said Bob Wamboldt, president and CEO of Johns Manville. “We thank Greg for his service and wish him the very best in his retirement.”