Tevian Dray is Professor of Mathematics at Oregon State University, where he has been on the faculty since 1988. A Fellow of the American Physical Society, based on his research in general relativity spanning 30 years, he has held postdoctoral positions in Germany, the Netherlands, and England, been a Fulbright Scholar in both India and Australia, and has won several teaching awards. A geometer by training, he is also active in science education. He is married to physicist Corinne Manogue; they have two children. His academic homepage can be found at https://math.oregonstate.edu/~tevian.
UPDATE: An online text covering multivariable and vector calculus is now available at
https://books.physics.oregonstate.edu/GVC;
a compantion volume including electro- and magneto-statics can be found at
https://books.physics.oregonstate.edu/GSF.