He has served on the editorial boards of two MAA journals and several of their book series.The fth interview of this series features a conversation with Roger Nelsen. His Springer book An Introduction to Copulas is eponymous for a mathematical precise and well written entrance into the fascinating eld of copulas. Moreover, it serves as a classical reference book, a large number of citations bear witness to this. He collaborated with seminal researchers in our eld, and kindly shares his view and memories with us. Roger's second strand of research -a combination of mathematical puzzles, art, and visualization -are "Proofs Without Words." He published several books, containing elegant visual justi cations of mathematical statements. In the following, our questions to Roger Nelsen are typeset in bold-face.
Biographical informationWas there any particular event or person during your childhood that in uenced your choice to study mathematics?As a child I always enjoyed puzzles, especially those using arithmetic and elementary geometry. My father was an engineer, so I had a great resource for answers to my questions. But my father rarely answered my questions; he would in turn ask me questions, to enable me to more or less solve the puzzle or problem on my own. In high school I had a truly inspiring teacher. My high school o ered two levels of a one-semester calculus course (high school calculus was rare in Indiana in the 1950s), and I was in the upper level. With one semester of that high school course, I was placed into third semester calculus when I entered DePauw University. The credit belongs to that very special teacher. He passed away several years ago, and I wasn't surprised to learn that many of his students went on to earn PhDs in mathematics.