The board of trustees of the Starfleet Academy was a group within Starfleet Academy involved with prescribing the requirements for and the awarding of degrees to students. The board was headed by a president.
As such, they were mentioned prominently on Patricia F. O'Malley's diploma when she received the degree of Master of Astronautics upon their recommendation in 2153. The signature of the board president, Herman Zimmerman, was on the diploma. (ENT: "Storm Front, Part II")