In a statement, Jere Harris, PRG's chairman and CEO, said: "It is with great sadness that we learned of the death of my dear friend and colleague Larry Kellermann. Throughout his long, distinguished career, Larry touched countless people, and he will be greatly missed.
"Larry had been part of PRG since the company's inception. His skills, honed throughout more than five decades in the industry, helped our company serve its clients with distinction.
"Larry's personal touch brought something extra to every interaction. In addition to his expertise, Larry shared with all of us his unique ability to make connections. He knew so many people that he was often the conduit by which we all shared information.
"On a more personal note, Larry had a unique passion for life and for our industry. He was one of the most well rounded people I have known. In addition to the professional relationship we shared, Larry and I spent many evenings enjoying a good meal and a cherished bottle of wine and debating a broad range of topics. Larry was always someone who brought vast knowledge and stimulating conversation to a meal. I will miss those times - his energy, his talent and his wit.
"We extend our sincere condolences to his wife, Ellen, as well as his three daughters and their families."
(Lee Baldock)