**Email: **stephen.billups@ucdenver.edu**Website:** http://math.ucdenver.edu/~billups/ **Office Location:** AB1-4221**Phone:** (303) 315-1735**Areas of Expertise:** Mathematical Programming, Operations Research, Computational Biology

Ph.D., Computer Science, University of Wisconsin-Madison, 1995

M.A., Mathematics, University of Wisconsin-Madison, 1993

M.S., Computer Science and Applications, Virginia Polytechnic Institute and State University, 1985

M.S., Mathematics and Computer Science, 1983

Dr. Stephen (Steve) Billups is an Associate Professor in the Department of Mathematical and Statistical Sciences at the University of Colorado Denver (UCD), with research interests in Optimization, Operations Research, and Computational Biology. He earned a Ph.D. in Computer Science and an M.S. degree in Mathematics from the University of Wisconsin-Madison; an M.S. in Computer Science and Applications from Virginia Tech, and a B.S. in Mathematics and Computer Science from George Mason University. Prior to completing his Ph.D., Steve worked at Sandia National Laboratories as a Computer Scientist. While at UCD, Dr. Billups has served as director of the Center for Computational Biology, director of the Applied Mathematics Graduate program, and director of the Mathematics Clinic program - a distinctive program at UCD, which engages graduate and advanced undergraduate students in challenging applied research projects supported by industry sponsors.

**S. C. Billups**, M. C. Neville, M. Rudoph, P. Schedin, and W. Porter, Identifying Significant Temporal Variation in Time Course Microarray Data Without Replicates. *BMC Bioinformatics, 2009, 10:96 doi:10.1186/1471-2105-10-96. *

K. Ahuja, L. T. Watson, and **S. C. Billups**, Probability-one homotopy maps for mixed complementarity problems, *Computational Optimization and Applications,41(2008): 363-375, *DOI 10.1007/s 10589-007-9107-z.

**S. C. Billups** and J. M. Kennedy, Minimum-support solutions for radiotherapy planning, *Annals of Operations Research, 119(2003): 229-245.*

**S. C. Billups** and L. T. Watson, A probability-one homotopy algorithm for nonsmooth equations and mixed complementarity problems, *SIAM Journal on Optimization, 12:3(2002): 606-626*.

**S. C. Billups**, A homotopy based algorithm for mixed complementarity problems, *SIAM Journal on Optimization, 12:3(2002):583-605.*

**S. C. Billups,** Improving the robustness of descent-based methods for semismooth equations using proximal perturbations, *Mathematical Programming*, 87(2000):153-175.

**S. C. Billups**, and M. C. Ferris, QPCOMP: A quadratic programming based solver for mixed complementarity problems, *Mathematical Programming*, 76(1997):533-562.

**S. C. Billups** and M. C. Ferris, Solutions to affine generalized equations using proximal mappings, *Mathematics of Operations Research., *24(1999):219-236.

L. T. Watson, **S. C. Billups**, and A. P. Morgan, Algorithm 652: HOMPACK: A suite of codes for globally convergent homotopy algorithms, *ACM Transactions on Mathematical Software*, 13(1987):281-310.

MATH 1130 Precalculus Mathematics

MATH 2421 Calculus III

MATH 3191 Linear Algebra

MATH 3200 Differential Equations

MATH 3301 Operations Research

MATH 4794 Optimization Modeling

MATH 4779/5779 Mathematics Clinic

MATH 5490 Network Flows

MATH 5593 Linear Programming

MATH 6410 Computational Bioloy

MATH 6595 Nonlinear Programming

MATH 7593 Advanced Linear Programming

MATH 7594 Integer Programming

MATH 7595 Advanced Nonlinear Programming

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