Research interests

Risk analysis, dependence in extreme scenarios, heavy-tail analysis, extreme value theory, graphical tools in statistics, spatial statistics, long range dependence, statistical inference for stochastic processes, network traffic modeling, climate modeling, social networks, congestion and queueing.

Recent preprints

  1. Tail probabilities of random linear functions of regularly varying random vectors (with V. Fasen-Hartmann and C. Klüppelberg), 2020. arXiv
  2. On the heavy-tail behavior of the distributionally robust newsvendor (with A. Dhara and K. Natarajan), 2019. arXiv
  3. Growth of common friends in a preferential attachment model (with S. Ghosh), 2019. arXiv


  1. Risk concentration under second order regular variation (with M. Kratz), Extremes (forthcoming), 2020+. arXiv
  2. Worst-case expected shortfall with univariate and bivariate marginals (with A. Dhara and K. Natarajan), INFORMS Journal on Computing (forthcoming), 2020+. arXiv
  3. Heavy-tailed random walks, buffered queues and hidden large deviations (with H. Bernhard), Bernoulli, 26(1), 61-92, 2020. arXiv
  4. Conditional excess risk measures and multivariate regular variation (with V. Fasen-Hartmann), Statistics and Risk Modeling, 36(1-4), 1-23, 2019. online
  5. Risk contagion under regular variation and asymptotic tail independence (with V. Fasen-Hartmann), Journal of Multivariate Analysis, 165, 194-215, 2018. arXiv
  6. Hidden regular variation under full and strong asymptotic dependence (with S. Resnick), Extremes, 20(4), 873-904, 2017. arXiv
  7. Detecting tail behavior: mean excess plots with confidence bounds (with S. Ghosh). Extremes, 19(2), 325-349, 2016. arXiv
  8. Generation and detection of multivariate regular variation and hidden regular variation (with S. Resnick). Stochastic Systems, 5(2), 195-238 (electronic), 2015. arXiv
  9. Extremal behavior of squared Bessel processes attracted by the Brown-Resnick process (with S. Engelke and E. Hashorva), Stochastic Processes and their Applications, 125(2), 780-796, 2015. arXiv
  10. Living on the multidimensional edge: seeking hidden risks using regular variation (with A. Mitra and S. Resnick), Advances in Applied Probability, 45(1), 139-163, 2013. arXiv
  11. Weak limits of exploratory plots in extreme value analysis (with S. Ghosh), Bernoulli, 19(1), 308-343, 2013. arXiv
  12. Four theorems and a financial crisis (with P. Embrechts and V. Fasen), International Journal of Approximate Reasoning, 54(6), 701-716, 2013. preprint
  13. On robust tail index estimation for linear long-memory processes (with J. Beran and D. Schell), Journal of Time Series Analysis, 33(3), 406-423, 2012. preprint
  14. Conditioning on an extreme component: model consistency and regular variation on cones (with S. Resnick), Bernoulli, 17(1), 226-252, 2011. arXiv
  15. Detecting a conditional extreme value model (with S. Resnick), Extremes, 14(1), 29-61, 2011. arXiv
  16. QQ plots, random sets and data from a heavy tailed distribution (with S. Resnick), Stochastic Models, 24 (1), 103-132, 2008. arXiv

Thesis, Reports

  • The conditional extreme value model and related topics. PhD Thesis, 2009.
  • Probabilistic Analysis of flooding at Murgenthal for Kernkraft-Goesgen Däniken (with V. Chavez-Demoulin and P. Embrechts), RiskLab internal report, 2010.


  • Heavy tails in a robust newsvendor model, June, 2018. Video
  • Multivariate regular variation: full dependence and strong dependence, May, 2016. Video