It made me sad to learn that Irwin died in 2013. I had the great pleasure of knowing Irwin for several years in the mid to late 70s in CT. I later moved to CA and now, too bad for me, cannot touch bases. Irwin was always ready with a zinger and once proclaimed he remembered every joke he’d ever heard. I believed it then as I do now. Irwin was truly gifted, but his PH.D never hindered him from hands on tasks like installing a new timing belt on his Pinto. We had once attended a Bluegrass concert in New York State which both concert and company I’ll never forget. My late but heartfelt condolences to Irwin’s family and to the community, both of whom he loved greatly.