Johns Manville (JM), a global building and specialty products manufacturer, announced that Bob Wamboldt will become president and CEO on Sept. 1, 2020. Mary Rhinehart, the company’s current chairman, president and CEO, will retain the role of chairman.  

Wamboldt joined Johns Manville in 2003 and became president of JM’s Insulation Systems business in February 2017. He earlier led the Engineered Products North America and Roofing Systems businesses at JM. Wamboldt is also chairman of the North American Insulation Manufacturers Association and previously served as president of the Asphalt Roofing Manufacturers Association. 

“I have been privileged to lead each of our businesses and learn first-hand the strength of the Johns Manville customer relationships, products, technologies and people,” Wamboldt says. “I look forward to working with the JM team and our customers to make the company even stronger in the global markets we serve. I also want to thank Mary for her leadership and guidance over the years and know I will benefit from her continued support as Chairman.” 

Before joining Johns Manville, Wamboldt worked 16 years at PPG Industries Inc., where he held a variety of positions in the company’s Fiber Glass and Coatings divisions. He earned a bachelor’s degree in chemistry from Lehigh University. He and his wife live in Denver. 

Rhinehart became Johns Manville’s president and CEO in 2012 and assumed the additional role of chairman in 2014. Before becoming president and CEO, she was the company’s chief financial officer for eight years. During her more than 40 years with Johns Manville, she also held leadership roles in treasury, supply chain, M&A and human resources, and she managed several of the company’s business units. 

“I am immensely proud of JM’s employees and all we have accomplished together,” Rhinehart says. “Johns Manville is an important part of my life, and its continued success is my top priority as we transition to new leadership. I am pleased to hand the company over to such an accomplished JM executive as Bob and am confident he and our 8,000 employees around the world will continue to build on JM’s 162-year track record of success.”

Johns Manville became a Berkshire Hathaway company in February 2001.

“Bob’s business acumen, broad base of experience, and extensive industry knowledge make him the natural successor to Mary as CEO,” says Greg Abel, Berkshire Hathaway’s vice chairman. “I also want to extend my gratitude to Mary for her dedication and commitment to JM over her entire career. Under her leadership as CEO, JM delivered exceptional performance, successfully expanded its market presence, and made sound, strategic investments to position the company for success well into the future.”  

Warren Buffett, chairman and CEO of Berkshire Hathaway, adds: “Mary was everything we had hoped to find in a CEO.” 

JM also announced that Greg Clarke will succeed Wamboldt and will become president of the company’s Insulation Systems business, effective Sept. 1, 2020.

“Greg is a trusted business partner and a critical member of JM’s leadership team,” Rhinehart says. “He brings a broad base of JM knowledge and experience to this new role and we are confident our Insulation Systems business will continue to succeed under his leadership.”  

Clarke was named JM’s senior vice president and chief financial officer when he rejoined the company in 2013. In this role, he led JM’s finance organization, global procurement and logistics operations, and corporate development activities. He previously worked for Johns Manville from 1997 to 2002 and was vice president and general manager of the company’s Building Insulation and Commercial & Industrial Insulation divisions.

Before returning to Johns Manville, Clarke was chief financial officer and a director at AeroGrow International Inc., an early-stage consumer products company, and president and CEO at Ankmar, LLC, a building products company. Earlier in his career, he held finance leadership and strategic planning roles at PepsiCo Inc. and The Coleman Company Inc.

“I’m excited about the opportunity to get back to our Insulation Systems business,” Clarke says. “We have an outstanding team and a strong market presence with the most complete line of insulation solutions for commercial, residential, OEM and industrial applications. I know there is a compelling future ahead for the business and I look forward to helping to achieve that vision.”

Clarke earned a bachelor’s degree in economics from Amherst College and an MBA from Columbia University Graduate School of Business. He serves on the AeroGrow Board of Directors and is a member of the Board of Alumni and Friends of the Leeds School of Business at the University of Colorado. He and his family live in Denver.