In my senior year as a microbiology major at UMass Amherst, I signed up for a molecular genetics course. The required text was the 1978 second edition of Gunther Stent’s Molecular Genetics: An Introductory Narrative, coauthored with Richard Calendar. I expected another biology book. What I got was something closer to a systems manual.
Dr. Stent did not write like a biologist. He wrote like an engineer who happened to be studying cells. He walked through gene regulation, replication, mutation, and phage behavior the way you would walk through a circuit: inputs, outputs, feedback, control points, and mechanisms you could draw on paper. He started with the experiments that produced the model, then built the model. Chapter by chapter the book treated the cell as a system you could analyze if you respected the rules. Dr. Stent had spent his career in the phage group around Max Delbrück, and that physics-trained mindset showed. Most textbooks of that era listed facts. Dr. Stent described how the field figured the facts out, which meant you understood why the model looked the way it did instead of memorizing it.
That book is where the transition started. I have told my students for years that system is a big word. A system is the difference between a pile of facts and a working understanding of something. Dr. Stent happened to come along at the moment I had finally accumulated enough background in biology, chemistry, and math to start seeing things at the system level. Without that book at that time, I am not sure I would have made the leap. With it, the leap felt almost obvious.
The summer after graduation I reread the book on the beach. I also worked through The Double Helix, James Watson’s account of the race to figure out DNA structure. Dr. Stent gave me the mechanism, Dr Watson the connection. I was hooked, though not yet on what.
That fall I started in a hospital clinical microbiology lab, planning to save money and apply to medical school. I plated cultures, ran sensitivities, and read Gram stains. I was OK at the work. Just OK. I figured out fairly quickly that I did not like it and needed a change. The IBM PC came out in 1981 and we got one in the lab. Around the same time the lab brought in a Vitek system for automated bacterial identification and susceptibility testing. Vitek came out of a NASA-McDonnell Douglas effort to detect microbial contamination on the Voyager spacecraft. Test cards held the biochemistry, an optical scanner read the cards, and software interpreted the patterns. I spent every spare minute learning how it worked, end to end. In 2012 I wrote about that experience here. Dr. Stent’s book kept rattling around at the same time. Biological systems are the most complex engineering systems I know of, and once you have read someone describe them that way, you cannot unsee it. The cell, the card, and the computer were all the same kind of object to me by then.
After two years in the lab I decided hospital work was not for me and went back to school full time. I moved to second shift so I could take engineering courses during the day. I wrote about that decision, and my friend Doug who hired me into the lab and supported the move, here. I finished an MS in Electrical Engineering at Western New England University. From there I spent decades consulting on and designing communications systems, teaching engineering, technology, and telecommunications courses, and directing a couple of NSF Centers of Excellence. Medical school never happened.
Dr. Stent died in 2008. His textbook is long out of print and the science has moved well past 1978. A copy lives on the Internet Archive at archive.org. It still reads like an engineering text written by someone who happened to be studying cells.
My copy is in a box in my cellar somewhere. I have not opened it in years, but I guarantee that if I shake it over a sheet of paper, beach sand will fall out. I’m digging it out and plan to reread it this summer, hopefully at least part of it back on a beach. One book did not decide my career on its own, but it planted a seed, and the rest was me catching up to what I had already started reading for fun.
So thank you, Dr. Stent. You died in 2008 and I doubt you thought a microbiology senior in western Massachusetts would read your book on a beach and change his life because of it. But you wrote the stuff that pointed me toward the stuff I actually wanted to do. You were one of several people whose work or example bent my path in a meaningful way. I will continue to write about the others here every once in a while too.
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