Dan Brinkman has been selected by the East Hawaii Regional Board of Hawaii Health Systems Corp. as Howard Ainsley’s interim replacement as CEO of the system's East Hawaii region. Brinkman will start his new position on Aug. 1. Ainsley will assist with the transition until his departure on Aug. 9. Brinkman will oversee the HHSC region, which includes hale Hoola Hamakua, Kau Hospital and Hilo Medical Center, the third largest hospital in the state for the last six years. “I’m honored and humbled…