Mark Talbert has been using Excel aggressively since version 1.0, and writing Excel macros both before and after the introduction of the VBA language. He has introduced several college-level courses over 15+ years on Excel modeling and VBA programming, which have together produced thousands of graduates who now work across a wide range of industries. His most frequent email subject line from former students is "Thank God I took your course!" followed closely by "I really wish I would have taken your course!"