Dr. Joel Feldman, Professor Emeritus of Mathematics, and one of the three faculty members in Mathematics behind the CLP series of free online texts used by thousands of UBC students every year. These top-quality resources are the primary references in the 4-stage calculus sequence MATH 100, 101, 200, 317. The authors prepared them on their own initiative, out of love for the subject and compassion for students, with no thought of recognition and virtually no resources from UBC.