Scott often belittled and berated Keenser, particularly regarding Keenser's tendency to climb up on things. It was clear that they were fond of each other, however; Keenser, in particular, was saddened when Scott transported with Kirk to the USS Enterprise.
After the Enterprise successfully defeated Nero and the Narada, Keenser joined the Enterprise crew as an engineer under Montgomery Scott. (Star Trek)
Keenser was played by Deep Roy. He was glad that the character was granted the opportunity to go aboard the Enterprise.