**Keith D. Stroyan** is Professor of Mathematics at the University of Iowa. His main research interests are in analysis and visual depth perception.

Stroyan, K. D.; Luxemburg, W. A. J. *Introduction to the theory of infinitesimals*. Pure and Applied Mathematics, No. 72. Academic Press [Harcourt Brace Jovanovich, Publishers], New York-London, 1976.
The book was cited over 365 times at Google Scholar in 2011.
Stroyan, K. D.; Bayod, José Manuel: Foundations of infinitesimal stochastic analysis. Studies in Logic and the Foundations of Mathematics, 119. North-Holland Publishing Co., Amsterdam, 1986.
Stroyan, K. D. Uniform continuity and rates of growth of meromorphic functions. Contributions to non-standard analysis (Sympos., Oberwolfach, 1970), pp. 47–64. Studies in Logic and Foundations of Math., Vol. 69, North-Holland, Amsterdam, 1972.