(written from a Production point of view)
David Balcorta is a stuntman and stunt actor who served as stunt double for Robert Beltran in the Star Trek: Voyager episode "Nemesis". He received no credit for his work and his costume was sold off on the It's A Wrap! sale and auction on eBay and was previously used by background actor Louis Ortiz in the episode "Blood Fever". 
Balcorta performed stunts in films such as the action film Zebra Force (1976, along stunt performers Gregory J. Barnett, Phil Chong, Tommy J. Huff, David LeBell, Gene LeBell, Spiro Razatos, Beth Nufer, Glenn R. Wilder, and stunt coordinator Eddy Donno), the science fiction sequel Predator 2 (1990, starring Kevin Peter Hall and stunts by Tony Brubaker, Jeff Cadiente, and Jimmy Ortega), Ivan Reitman's action comedy Kindergarten Cop (1990, with stunts by Ted Barba and Christopher Doyle, under stunt coordination by Joel Kramer), and the action film Militia (2000, with stunts by George Colucci, Dennis Madalone, and Lincoln Simonds).