Doctor Aaron Brown was a human scientist in the 23rd century and was a long-time assistant of Dr. Roger Korby. Aaron Brown had worked with Dr. Korby for many years, and accompanied him on many archaeological expeditions. In 2259, Brown accompanied Korby on an expedition to Vestalan along with Christine Chapel. Brown became good friends with Christine, and she often referred to him as "Brownie", and he was happy when Korby and Chapel were engaged. (TOS short story: "Snake Pit!"; TOS episode: "What Are Little Girls Made Of?")