John W. Welborn

Academic Appointments

Lecturer in Economics
Lecturer in the Political Economy Project
Lecturer in Mathematics

Ph.D., Economics, George Mason University, 2013
M.A., Economics, London School of Economics, 2005
A.B., Economics modified with Math, Dartmouth College, 2002
International Baccalaureate Diploma, Smoky Hill High School, 1998

Selected Publications

Stratmann, Thomas and Welborn, John W. “Informed short selling, fails-to-deliver, and abnormal returns.” Journal of Empirical Finance 38.A (2016): 81-102, ISSN 0927-5398,

Stratmann, Thomas, and Welborn, John W. “The Options Market Maker Exception to SEC Regulation SHO.” Journal of Financial Markets 16.2 (2013): 195–226.

Stratmann, Thomas and Welborn, John W. “Exchange-Traded Funds, Fails-to-Deliver, and Market Volatility” (November 30, 2012). GMU Working Paper in Economics No. 12-59. Available at SSRN: or

Welborn, John W. “The Phantom Shares’ Menace.” Regulation 31:1 (2008),