Until the inception of Empirical Mark was a Senior Portfolio Manager at Merrill Lynch and one of the two partners behind the Rules Based Investing® platform, which is a suite of quantitatively driven investment models. While at Merrill Lynch, Mark's responsibilities included investment model development, portfolio management and business development. As an in-house portfolio manager Mark developed partnership arrangements with more than 190 Merrill Lynch and legacy Advest financial advisors. Prior to joining Merrill Lynch in 2005 Mark spent eleven years at Advest, where he held the title of First Vice President Investments and Branch Office Manager. Additionally, Mark held the position of Vice President for the Investment Services Group of Donaldson, Lufkin and Jenrette, an institutional research and trading house where he worked on the sell side servicing institutional clients. Mark began his career at Shearson-Lehman American Express in 1983. Mark holds a B.A. in Economics from Connecticut College.