Debra Anne Ross Lawrence is the author of the popular Master Math series: Basic Math and Pre-Algebra, Algebra, Geometry, Pre-Calculus, Trigonometry, Calculus, and Essential Physics. Debra is also the author of The 3:00 PM Secret: Live Slim and Strong Live Your Dreams and The 3:00 PM Secret 10-Day Dream Diet. Debra earned a double BA in biology and chemistry with honors from the University of California at Santa Cruz and an MS in chemical engineering from Stanford University. David Allen Lawrence holds Bachelor and Master of Science degrees in Management from the Massachusetts Institute of Technology and a Juris Doctor cum laude from the University of Minnesota. Debra and David co-authored Arrows Through Time. Their extra-literary activities include all-season mountaineering, maintaining an ultra-healthy lifestyle, pursuing God’s will, and living happily ever after.