Stephan Ramon Garcia is an American mathematician. He is the W.M. Keck Distinguished Service Professor and Professor of Mathematics at Pomona College, in California, United States. Garcia has been a faculty member at Pomona since 2006. He is the author of more than 100 research papers, many with undergraduate co-authors, and four books. Garcia works in operator theory, complex variables, matrix analysis, number theory, and discrete geometry. He serves on the editorial board of several well-known journals and has received four National Science Foundation grants as principal investigator.