Philip Stanley is a graduate of the Rensselaer Polytechnic Institute with a B.S. in engineering. He also holds an M.S. in computer science from Ohio State University. Stanley worked as a computer scientist until 1992, at which time he retired from engineering to become a full-time dealer in and appraiser of antique scientific instruments and tools. He has written two books on antique measuring instruments, and numerous articles on instruments and technology, and has given several talks on these subjects. He is currently researching early U.S. patents with a view toward a book dealing with this subject. He is a member of the Oughtred Society, the Scientific Instrument Society, the Early American Industries Association, and the Mid-West Tool Collector’s Association. He is married, with three children and four grandchildren, and resides in Worcester, Massachusetts.