J.D. Seader is Professor Emeritus of Chemical Engineering at the University of Utah.  He received B.S. and M.S. degrees from the University of California at Berkeley and a Ph.D. from the University of Wisconsin.  He has authored or coauthored 110 technical articles, 8 books, and 4 patents, and also coauthored the section on distillation in the 6th and 7th editions of Perry's Chemical Engineers' Handbook.  In 2004 he received the CACHE Award for Excellence in Chemical Engineering Education from the ASEE; and in 2004, he was a co-recipient of the Warren K. Lewis Award for Chemical Engineering Education of the AICHE.

Ernest J. Henley is Professor of Chemical Engineering at the University of Houston.  He received his B.S. degree from the University of Delaware and his Dr. Eng. Sci. from Columbia University, where he served as a professor from 1953 to 1959.  He has authored or coauthored 72 technical articles and 12 books, the most recent one being Probabilistic Risk Management for Scientists and Engineers.  In 1998, he received the McGraw-Hill Company Award for "Outstanding Personal Achievement in Chemical Engineering", and in 2002, he received the CACHE Award of the ASEE for "recognition of his contribution to the use of computers in chemical engineering education."  He is President of the Henley Foundation.