Dr. Tom Brody received his Ph.D. from the University of California at Berkeley in 1980 and has published several research articles in the areas of enzymology, metabolism and pharmacokinetics of folates and related amino acids. For his post-doctoral work, also at U.C. Berkeley, the author cloned, sequenced, and expressed an oncogene, and purified the encoded protein (xeroderma pigmentosum E; XPE). The XPE gene encodes a DNA repair protein. Later, he performed research on the structure of an antibody (natalizumab) used for treating multiple sclerosis. At an earlier time, he wrote two editions of Nutritional Biochemistry, published by Elsevier, Inc. The author is a registered patent agent.