(written from a Production point of view)
Arlo Hanlan Hemphill (born 7 October 1971; age 45) is an American actor, background performer, consultant, stand-in, and producer who appears as a shipyard worker in 2009's Star Trek. He is also an expert marine biologist and a dedicated explorer and ocean conservationist.
Hemphill was born in Baltimore, Maryland. He graduated from the Palm Beach Atlantic University with a Bachelor of Science degree in Biology with Marine specialization and a minor in Oceanography. He received training as an actor from L.A. Casting in Los Angeles, California, and from The Network Studio in San Francisco, California. One of his earliest acting roles was in a high school production of The Sound of Music, in which he played Captain Von Trapp, the same character Christopher Plummer portrayed in the acclaimed 1965 film directed by Robert Wise. 
As an independent consultant based in California, Hemphill offers "services in expedition/exploration support, marine conservation, ocean policy, scientific diving, biological assessments, and film and media"  He is a national of the Explorers Club and a member of the World Commission on Protected Areas (WCPA) High Seas Task Force. Nature magazine listed Hemphill as one of over 100 global biodiversity experts, noting his expertise with biodiversity in the Greater Caribbean and the Chocó-Darién-Western Ecuador.
Hemphill made his first film appearance as an extra in the 1997 science fiction thriller Contact, also featuring Geoffrey Blake, Robin Gammell, and Tucker Smallwood. He returned to film approximately ten years later, working as a background performer in numerous projects, including Four Christmases (with cinematography by Jeffrey L. Kimball), What Happens in Vegas (starring Michelle Krusiec), Eagle Eye (produced by Alex Kurtzman and Roberto Orci and starring William Sadler), and Bedtime Stories (starring Keri Russell, with production design by Linda DeScenna). All of these films were released or are set for release in 2008.
He has also appeared as an extra on such television series as CSI: NY (starring Robert Joy), CSI: Miami, Shark (starring Jeri Ryan, in an episode with Jonathan Banks), Desperate Housewives (starring Teri Hatcher and the voice of Brenda Strong and directed by Larry Shaw), and Bones.
Star Trek was Hemphill's second film starring Chris Pine; the first was the drama Bottle Shock, in which Hemphill plays a French waiter. Hemphill's acting credits also include supporting roles in the independent films The Rains of Astoria and The Mandalorian Legacy and featured appearances on TV shows such as Without a Trace (starring Enrique Murciano, in an episode with Jennifer Parsons and Bill Smitrovich), CSI:Crime Scene Investigation (starring Wallace Langham), and Criminal Minds. He has appeared in several commercials and internet projects, as well.