William R Parrish, Ph.D, P.E. is a retired Senior Research Associate from ConocoPhillips R&D. He provided consulting in plant operations, especially in the areas of gas hydrates, physical properties and statistics. He has been on numerous AIChE committees and currently on the Licensing and Professional Development Committee (LPDC) and was the initial chair. He has served on the NCEES PE Exam Development Committee for over 20 years and is a past chair. He represents AIChE on various committees involving licensure.