Zethmayr, David

US Navy (electronics); AA, Wright College, Chicago; bioengineering studies, U. of Illinois; instructor in general science and lab practice, Nat'l Foundation of Microbiology, Chicago; medical technology, Mt Sinai Hospital Lab School, Chicago; software developer; adjunct faculty, Center for Gifted, National-Louis University, Evanston, IL;original contributions to boundary mathematics, author of popularized presentations. Musical entertainer, a cappella choir director; Residing in Mauston, Wisconsin.