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 with applications to service, healthcare and inventory systems;   Performance analysis, control and stability of stochastic systems

Published & Accepted Papers

  • Wu A., Bassamboo A., Perry O.   "Service Systems with Dependent Service and Patience Times".   Management Science, forthcoming.  

  • 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, 27(6), 2017, pp. 3385-3434.

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

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

  • 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.   "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 Approximation for Service Systems Responding to Unexpected Overloads".   Operations Research, 59(5), 2011, pp. 1159-1170.

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

  • Grants

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

  • July-August 2017. Northwestern Memorial Hospital (NMH), $49,382 (with Jing Dong; implementing our model for patient-flow in inpatient units).

  • Teaching

    • IEMS 315: Stochastic Models and Simulation (undergraduate course)

      • Fall 2011, Spring 2013, Fall 2013, Spring 2015, Fall 2016, Winter 2016, Winter 2017, Fall 2017

    • IEMS 202: Probability (undergraduate course)

      • Winter 2015

    • IEMS 460-1: Stochastic Models I (core PhD course)

      • Winter 2013, Winter 2014, Winter 2015, Winter 2016, Winter 2017, Winter 2018

    • IEMS 464: Advanced Queueing Theory (PhD course)

      • Winter 2012, Fall 2013, Fall 2015