David C. VellaDavid C. Vella is Professor and Associate Chair of Mathematics at Skidmore College, New York. He has taught college mathematics for over thirty-five years, and has been an organizer of the Hudson River Undergraduate Mathematics Conference (HRUMC) sine its inception in 1993. He is a member of the AMS, the MAA, and a charter member of the New York Alpha Theta chapter of Pi Mu Epsilon. His Erdős number is four. Read More Read Less