From 1983 to 1988 Shull worked as a marketing representative at
IBM. She became a short-term trader and trading desk manager in 1994 at the
Chicago Board Options Exchange, and later traded futures as a member of the
Chicago Mercantile Exchange. During this period Shull began to formulate her application of neuropsychology to investment and trading at banks, hedge funds, and proprietary funds, working in the budding interdisciplinary field of
neuroeconomics. In 2003, Shull created The ReThink Group to address the challenges of slumps, repetitive mistakes and confidence crises in portfolio managers and traders. In 2016, ReThink added Olympians, pro poker players and professional athletes to their roster. Shull and The ReThink Group have developed new technologies and techniques for understanding and evaluating decision-making. In 2016, for
Bloomberg, The ReThink Group developed the "Trader Brain Exercise", or what they now call the "Intuition Brain Game". Additionally, Shull and The ReThink Group have created a tool called "HEADSx", a talent assessment metric to evaluate potential hires. == Legal ==