Leonard (Len) Yates is a professional programmer with over twenty-five years of experience in software development. He is the President and founder of OptionVue™ Systems International, Inc., which specializes in options trading software and services. Prior to founding OptionVue™ Systems International, Len was a software engineer at Tandem Computers, and a hardware and software engineer at IBM Corp. An active options trader with a comprehensive knowledge of corporate finance and financial models, Len has made important contributions in the field of options pricing models since the founding of his company–the most notable being the "Yates adjustment" to the popular Black-Scholes model as applied to American-style puts. Len holds a bachelor of science degree in electrical engineering from Purdue University.