I graduated in 1963 from the University of Minnesota (Minneapolis) with a B.S. in Mathematics (with minors in the physical and biological sciences). Subsequently, working as an applied mathematician and attending graduate school at the University of Maryland (College Park), I received a M.A. in Mathematics in 1968. Returning to academics I received a Sloan Foundation Grant from the University of Chicago in 1969 and spent a number of years as a graduate student in Mathematical Biology.
For various reasons I began to question a possible future career in academics and moved in the 70s to Wisconsin where, while self employed as a system analyst, I would, in 1989, receive a B.S. in secondary mathematics education at the University of Wisconsin (Stevens Point) with certification in Learning Disabilities. I taught in both Wisconsin and Colorado and in the 90s returned to graduate school at the University of Michigan (Ann Arbor). I received a Ph. D. in Secondary Mathematics Education in 2003 and in the same year became faculty in Childhood Education (which I preferred for various reasons over Secondary Education) at the City College of New York. I was tenured in 2008 and I retired from City College in 2014.