Hsien-Hsin Tung, PhD, is the co-founder of AcrysPharm, LLC. He founded the crystallization lab. at Merck and center of excellence of particle engineering at AbbVie. Edward L. Paul, PhD, (deceased) was retired Director of Chemical Engineering R & D at Merck Research Laboratories. Michael Midler, PhD, (deceased) was retired Senior Investigator, Chemical Engineering R&D at Merck. James A. McCauley, PhD, was a senior investigator in the Analytical R & D at Merck until his retirement, after which he became an adjunct professor in the Department of Chemical and Biochemical Engineering at Rutgers University.