Steve Drekic

Professor / Associate Chair – Undergraduate Studies

Steve Drekic
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Steve Drekic

Steve Drekic's Google Scholar profile

Research interests

Professor Drekic has co-authored over 40 articles, and has published in key journals across several disciplines, including actuarial science, operations research, and statistics. His work has garnered particular attention in the fields of applied probability, insurance risk/ruin theory, and queueing theory. Professor Drekic's expertise lies in the use of probabilistic/stochastic techniques with advanced computational methods to analyze mathematical problems arising in several different application areas.


Professor Drekic is a Professor in the Department of Statistics and Actuarial Science at the University of Waterloo. He received his BA with Honours in Mathematics and Statistics from the University of Windsor in 1994. A year later, he received his MSc degree in Statistics from the University of Windsor. In 1999, he completed his dissertation ("Methods to Reduce Delay in Preemptive Priority Queues") to earn his PhD in Statistics from the University of Western Ontario. Since joining the University of Waterloo in 2000, Professor Drekic has taught a variety of courses in actuarial science, mathematics, and statistics. In 2015, he was awarded both a Department of Statistics and Actuarial Science Teaching Award and a Faculty of Mathematics Award for Distinction in Teaching.

Professor Drekic has been actively involved in the Canadian Operational Research Society (CORS). He took over the editorial duties of the Society's newsletter, the CORS Bulletin, in 1998. He held this position for four years before becoming an executive Councillor in 2002. This was then followed by a nomination to Vice President, and finally, to the position of President which he held in 2005-2006. For his longstanding service to the Society, Professor Drekic was awarded a CORS Service Award in 2007. From 2015-2017, he served as President of the Queueing Theory Special Interest Group of CORS, which was founded in 2011 and has, as its chief mandate, the promotion of the discipline within Canada. In addition, Professor Drekic became an elected member of the International Statistical Institute in 2005 and served as an Associate Editor for the INFORMS Journal on Computing from 2009-2018.

Selected publications

  • K. Granville and S. Drekic. The unobserved waiting customer approximation. Queueing Systems 99 (2021) 345-396.
  • K. Granville and S. Drekic. A 2-class maintenance model with dynamic server behavior. TOP 28 (2020) 34-96.
  • K. Granville and S. Drekic. On a 2-class polling model with reneging and k_i-limited service. Annals of Operations Research 274 (2019) 267-290.
  • K. Granville and S. Drekic. A 2-class maintenance model with a finite population and competing exponential failure rates. Queueing Models and Service Management 1 (2018) 141-176.

  • V.A. Fajardo and S. Drekic. Waiting time distributions in the preemptive accumulating priority queue. Methodology and Computing in Applied Probability 19 (2017) 255-284.

  • S.S. Kim and S. Drekic. Ruin analysis of a discrete-time dependent Sparre Andersen model with external financial activities and randomized dividends. Risks 4 (1) (2016) 2:1-15.

  • V.A. Fajardo and S. Drekic. On a general mixed priority queue with server discretion. Stochastic Models 32 (2016) 643-673.

  • V.A. Fajardo and S. Drekic. Controlling the workload of M/G/1 queues via the q-policy. European Journal of Operational Research 243 (2015) 607-617.

  • S. Drekic, D.A. Stanford, D.G. Woolford and V.C. McAlister. A model for deceased-donor transplant queue waiting times. Queueing Systems 79 (2015) 87-115.

  • S. Drekic and A.M. Mera. Ruin analysis of a threshold strategy in a discrete-time Sparre Andersen model. Methodology and Computing in Applied Probability 13 (2011) 723-747.

  • G.E. Willmot and S. Drekic. Time-dependent analysis of some infinite server queues with bulk Poisson arrivals. INFOR 47 (2009) 297-303.

  • E.C.K. Cheung, D.C.M. Dickson and S. Drekic. Moments of discounted dividends for a threshold strategy in the compound Poisson risk model. North American Actuarial Journal 12 (3) (2008) 299-318.

  • A.L. Badescu, S. Drekic and D. Landriault. On the analysis of a multi-threshold Markovian risk model. Scandinavian Actuarial Journal (2007) 248-260.

  • A.S. Alfa and S. Drekic. Algorithmic analysis of the Sparre Andersen model in discrete time. ASTIN Bulletin 37 (2007) 293-317.

  • S. Drekic and G.E. Willmot. On the moments of the time of ruin with applications to phase-type claims. North American Actuarial Journal 9 (2) (2005) 17-30.

  • S. Drekic, J.E. Stafford and G.E. Willmot. Symbolic calculation of the moments of the time of ruin. Insurance: Mathematics and Economics 34 (2004) 109-120.

  • S. Drekic, S. A preemptive resume queue with an expiry time for retained service. Performance Evaluation 54 (2003) 59-74. Erratum 54 (2003) 75-76.

  • S. Drekic and J.E. Stafford. Symbolic computation of moments in priority queues. INFORMS Journal on Computing 14 (2002) 261-277.

  • S. Drekic and D.A. Stanford. Reducing delay in preemptive repeat priority queues. Operations Research 49 (2001) 145-156.

  • S. Drekic and D.A. Stanford. Threshold-based interventions to optimize performance in preemptive priority queues. Queueing Systems 35 (2000) 289-315.