Dr. David Tabak is a member of the Securities and Financial Services practice at National Economic Research Associates, Inc. (NERA") . As part of his work at NERA, he has testified at arbitrations and in state and federal courts in areas including business valuation, lost profit determination, financial product valuations, and investment performance. Dr. Tabak received bachelors degrees in physics and economics from the Massachusetts Institute of Technology. He obtained a masters and Ph.D. in economics from Harvard University.

Dr. Tabak has performed valuations of restricted stock, public and privately-held companies, options and complex derivatives, secured loans, commodity futures, future damage claims, and financial and nonfinancial institutions. In addition, he has worked on projects concerning contract disputes and valuations, antitrust proceedings, patent valuations, harm to business reputation, and disputes involving broker/dealers and investment advisors. Dr. Tabak's non-litigation work has included market analyses for a start-up internet venture, assisting a financial institution in new product development, and interpretation of statistical analyses of treatment effectiveness for a program for at-risk youth.

Much of Dr. Tabak's work has focused on securities class actions, where he has performed analyses involving issues of class certification, liability, materiality, affected trading volume, and damage calculations. He has also worked on opt-out cases and cases where a company that experienced a shareholder class action was involved in subsequent litigation with advisors that may have contributed to liability in the class action. Dr. Tabak has also provided testimony by affidavit on the fairness of a proposed class action settlement that was later approved by the court.

Dr. Tabak has published articles or working papers on areas including marketability discount measurement, analysis of class conflicts in securities class actions, uses of event studies to measure damages in commercial disputes, and on the use of option premiums to measure market evaluations of companies' Y2K preparedness. He has been a speaker at seminars that provide continuing legal education credits.