Chris Enke's first book was "Electronics for Scientists" written with Howard Malmstadt, and in later versions with Stan Crouch as well. This book is the ninth he has authored or coauthored. Between these "bookends" he has been active in research and teaching. He is currently Professor of Chemistry at The University of New Mexico and Professor Emeritus at Michigan State University. His Ph.D. was earned at the University of Illinois. He has mentored over 60 Ph.D. students whose theses are in the areas of electroanalytical chemistry, computer-based instrumentation, optical spectroscopy, and mass spectrometry. Over 150 papers and book chapters have resulted from this research. He has received American Chemical Society awards in Chemical Instrumentation and Computers in Chemistry, the Distinguished Faculty Award at Michagan State University, and is an AAAS Fellow. Among his several inventions is the triple quadrupole mass spectrometer (with Rick Yost) for which they received the Distinguished Contribution Award from the American Society for Mass Spectrometry. Chris has served as President of ASMS, Chairman of the Computers in Chemistry Division of ACS, and has been a member of many professional society and journal advisory boards. Thus present book was written out of his love for the subject of analytical chemistry and in appreciation of congenial colleagues, stimulating students, and rewarding research.