I'm in my 36th year (and last months) of university teaching, and I still love hard-working, curious students. My research work has been in differential and complex algebraic geometry.
For better or for worse, I've authored textbooks on abstract algebra, linear algebra, an integrated course in multivariable calculus/analysis and linear algebra, and differential geometry [the last freely available on my website].
With thanks to Patty Wagner, Cameron Zahedi, Cameron Bjorklund, Justin Payan, and especially to Eric Lybrand, my lectures—flaws and all—for my Multivariable Mathematics course at UGA can now be viewed on YouTube at https://www.youtube.com/channel/UCp9W-et2Zbx7u5_VMiXGtPQ. This course is based on my text, Multivariable Mathematics: Linear Algebra, Multivariable Calculus, and Manifolds.