Jack Orenstein's Erdös number is 3:

• Deheuvels, P., Erdös, P., Grill, K., and Rivisz, P. (1987). Many heads in a short block. Mathematical Statistics and Probability Theory, Vol. A Reidel, Dordrecht, 53-67.
• Deheuvels, P., Devroye, L., and Lynch, J. (1986). Exact convergence rate in the limit theorems of Erdös-Rényi and Shepp. The Annals of Probability 14: 209-223.
• Jack A. Orenstein, T. H. Merrett, Luc Devroye: Linear Sorting with O(log n) Processors. BIT 23(2): 170-180 (1983)