Daniel Bach Daniel Bach earned his B.A and M.A degrees in Mathematics from the University of California at Berkeley, specializing in algebraic number theory. He is currently a popular math instructor at Diablo Valley College, having previously taught the subect at Mills College and UC-Berkeley. Dan was head tutor for the Minority Engineering Students Asociation and a Math Specialist at Black Pine Circle Day School, where he coauthored several California Junior High Math Competitions during the 1980s. Dan is the author and programmer of "Dan's Basic Math Clinic," an interactive multimedia courseware in arithmetic, prealgebra, and beginning algebra. In the 1990s, Dan was awarded an NSF developer's grant to write a series of notebooks Precalculus and Mathematica, for the Interactive Math Textbook Project. Since 1997, he has maintained an active website with free math lessons, a weekly contest, feature pages, and an international puzzle-problem community. He is an avid coffee drinker, runner, and bicyclist and enjoys creating 3D animations in his hard-to-find spare time. Read More Read Less