Irving: Good crew it's cool :) zenerx review The union and the players haven't been able to come to an agreement over who will conduct the population study. In the recent emails sent to the players, Dr. Alan Rogol is named as the supervisor of the study. Rogol was hired jointly by the NFL and NFLPA. Donald Berry, Ph.D. "will design the study protocol and conduct the analysis," the union wrote, "and a second biostatisician will independently review both the protocol and the analysis.