Dr. Linden has been a director of Reynolds Metals Company, Sonat Inc. and UGI Corporation and currently serves on the boards of the AES Corporation, a leading global power company, Centennial Holdings, Inc., a venture capital fund manager, and Proton Energy Systems, Inc., a manufacturer of hydrogen generators. He has consulted for gas pipeline and electric utility companies; served on many federal advisory bodies dealing with energy policy, technology and regulation beginning with the Kennedy administration; held a presidential appointment during the Ford administration; and authored or co-authored more than two hundred publications and twenty-seven patents.

He holds a B.S. from the Georgia Institute of Technology, an M.Ch.E. from Polytechnic University and a Ph.D. from the Illinois Institute of Technology, all in chemical engineering.