O'Hara is the Robert W. Purcell Professor of Management, a professor of finance, and acting director in Graduate Studies at the Samuel Curtis Johnson Graduate School of Management at Cornell University.
Her most recent research has focused on high frequency market microstructure,[2] bond market microstructure, the impact of transparency on trading system performance, listing and delisting issues in securities markets, block chains and cryptocurrencies, and the role of liquidity and information risk in asset pricing.
In addition, O'Hara publishes widely on a broad range of topics including banking and financial intermediaries, law and finance, and experimental economics.
(with David Easley, and Soeren Hvidkjaer),[6] and 2003 Smith-Breeden Distinguished Paper Award for "Presidential Address: Liquidity and Price Discovery.
She has consulted for a number of companies and organizations, including Microsoft, Merrill Lynch, Credit Suisse First Boston, the New York Stock Exchange, Bristol-Myers Squibb, and the World Federation of Exchanges.