Ohad Perry's Homepage

Ohad Perry

Assistant Professor, Industrial Engineering and Management Sciences
McCormick School of Engineering
Northwestern University

Contact information

Email: ohad.perry@northwestern.edu

Phone: (847) 467-4443

Fax: (847) 491-8005


Department of Industrial Engineering & Management Sciences
2145 Sheridan Road, Room C250
Evanston, IL 60208


B.Sc., Mathematics and Statistics, University of Haifa   (summa cum laude),  2004.

M.S., Operations Research, IEOR Department, Columbia University,   2005.

Ph.D., IEOR Department, Columbia University,   2010.              Doctoral Dissertation    (Adviser: Ward Whitt.)

Research interests

Stochastic systems and applied probability;   Performance analysis and control of queuing networks in service systems;  Applications of queuing theory in control and design of call centers;   Inventory models.

Published Papers

  • Perry O., Whitt W.   "Responding to Unexpected Overloads in Large-Scale Service Systems".   Management Science, 55 (8), 2009, pp. 1353-1367.  

  • Perry O., Whitt W.   "A Fluid Approximation for Service Systems Responding to Unexpected Overloads".   Operations Research, 59(5), 2011, pp. 1159-1170.

  • Perry O., Whitt W.   "An ODE for an Overloaded X Model Involving a Stochastic Averaging Principle".   Stochastic Systems, 1(1), 2011, pp. 59-108.  

  • Perry O., Whitt W.   "A Fluid Limit for an Overloaded X Model Via a Stochastic Averaging Principle".   Mathematics of Operations Research, 38(2), 2013, pp. 294-349.     

  • Gurvich I., Perry O.   "Overflow Networks: Approximations and Implications to Call-Center Outsourcing".   Operations Research, 60(4), 2012, pp. 996-1009.

  • Perry O., Whitt W.   "Diffusion Approximation for an Overloaded X Model Via a Stochastic Averaging Principle".   Queueing Systems, 76(4), 2014, pp. 347-401.  

  • Pang G., Perry O.   "A Logarithmic Safety Staffing Rule for Contact Centers with Call Blending".   Management Science, 61(1), 2015, pp. 73-91.

  • Perry O., Whitt W.   "Achieving Rapid Recovery in an Overload Control for Large-Scale Service Systems".   INFORMS Journal on Computing, 27(3), 2015, pp. 491-506.

  • Perry O., Whitt W.   "Chattering and Congestion Collapse in an Overload Switching Control".   Stochastic Systems, 6(1), 2016, pp. 132-210.

  • Den Boer A., Perry O. and Zwart B.   "Dynamic Pricing Policies for an Inventory Model with Random Windows of Opportunities".   Naval Research Logistics, forthcoming.

  • Moyal, P., Perry O.   "On the Instability of Matching Queues".   Annals of Applied Probability, forthcoming.

  • Grants

  • 2014-2017. National Science Foundation (NSF), CMMI 1436518, $296,011.

  • Teaching

    • Undergraduate Course: IEMS 315, Stochastic Models and Simulation

      • Fall 2011, Spring 2013, Fall 2013, Spring 2015, Fall 2016, Winter 2016

    • Undergraduate Course: IEMS 202, Probability

      • Winter 2015

    • Ph.D. Course: IEMS 464, Advanced Queueing Theory

      • Winter 2012, Fall 2013

    • Ph.D. Course: IEMS 460-1, Stochastic Models I

      • Winter 2013, Winter 2014, Winter 2015, Winter 2016, Winter 2017