Allen Robert Tannenbaum (born January 25, 1953) is an American/Israeli applied mathematician and presently Distinguished Professor of Computer Science and Applied Mathematics & Statistics at the State University of New York at Stony Brook. He is also Visiting Investigator of Medical Physics at Memorial Sloan Kettering Cancer Center in New York City. He has held a number of other positions in the United States, Israel, and Canada including the Bunn Professorship of Electrical and Computer Engineering and Interim Chair, and Senior Scientist at the Comprehensive Cancer Center at the University of Alabama, Birmingham. He received his Ph.D. with thesis advisor Heisuke Hironaka at the Harvard University in 1976.
Tannenbaum has done research in numerous areas including robust control, computer vision, and biomedical imaging, having almost 500 publications. He pioneered the field of robust control with the solution of the gain margin and phase margin problems using techniques from Nevanlinna–Pick interpolation theory, which was the first H-infinity type control problem solved. Tannenbaum used techniques from elliptic curves to show that the reachability does not imply pole assignability for systems defined over polynomial rings in two or more variables over an arbitrary field. He pioneered the use of partial differential equations in computer vision and biomedical imaging co-inventing with Guillermo Sapiro an affine-invariant heat equation for image enhancement. Tannenbaum further formulated a new approach to optimal mass transport (Monge-Kantorovich) theory in joint work with Steven Haker and Sigurd Angenent. In recent work, he has developed techniques using graph curvature ideas for analyzing the robustness of complex networks.
His work has won several awards including IEEE Fellow in 2008, O. Hugo Schuck Award of the American Automatic Control Council in 2007 (shared with S. Dambreville and Y. Rathi), and the George Taylor Award for Distinguished Research from the University of Minnesota in 1997. He has given numerous plenary talks at major conferences including the Society for Industrial and Applied Mathematics (SIAM) Conference on Control in 1998, IEEE Conference on Decision and Control of the IEEE Control Systems Society in 2000, and the International Symposium on the Mathematical Theory of Networks and Systems (MTNS) in 2012. He is also well known as one of the authors of the textbook Feedback Control Theory (with John Doyle and Bruce Francis), which is currently a standard introduction to robust control at the graduate level.
In 2011 an audit accuses professors Allen Tannenbaum and his wife Rina Tannenbaum that they violated Georgia Institute of Technology and State policies by working simultaneously at Georgia Tech and Technion-Israel Institute of Technology. The report contended $1.4 million in salary and federally sponsored travel to Israel for Allen Tannenbaum and $750,000 for Rina Tannenbaum. 
- Allen Robert Tannenbaum at the Mathematics Genealogy Project
- "IEEE Control Systems Fellows". IEEE Control Systems Society. Archived from the original on 2012-11-15. Retrieved 2012-10-28.
- "O. Hugo Schuck Award" (PDF). Archived from the original (PDF) on 2012-09-16. Retrieved 2012-10-28.
- "George Taylor Award for Distinguished Research". Archived from the original on 2012-09-29.
- "Plenary Speaker 20th International Symposium on the Mathematical Theory of Networks and Systems".