About the author Ronald Tallarida holds B.S. and M.S. degrees in physics/ mathematics and a Ph. D. in pharmacology. His primary appointment is professor of pharmacology at Temple Univer sity School of Medicine, Philadelphia. For over 30 years he o served as an adjunct professor of biomedical engineer ing at Drexel University in Philadelphia where he received the lindback Award for Distinguished Teaching of math- matics. As an author and researcher, he has published over 250 works that include seven books, has been the recipient of research grants from NIH, and has served as a consultant to both industry and government agencies. His main research interests are in the areas of mathematical modeling of bio- logical systems, feedback control, and the action of drugs nd drug combinationAbout the Author Ronald J. Tallarida holds B.S. and M.S. degrees in physics/ mathematics and a Ph.D. in pharmacology. His primary appointment is professor of pharmacology at Temple Univer￾sity School of Medicine­, Philadelphia. For over 30 years he also served as an adjunct professor­ of biomedical engineer￾ing at Drexel University in Philadelphia where he received the Lindback Award for Distinguished Teaching of Math￾ematics. As an author and researcher, he has published over 250 works that include seven books, has been the recipient of research grants from NIH, and has served as a consultant to both industry and government agencies. His main research interests are in the areas of mathematical modeling of bio￾logical systems, feedback control, and the action of drugs and drug combinations