(written from a Production point of view)
Jack Janda is an Arab-American actor and producer who played a waiter in Sisko's Creole Kitchen in the Star Trek: Deep Space Nine episodes "Homefront" and "Paradise Lost". He received no credit for his appearances and was identified by the name tag of his costume which ws sold off on the It's A Wrap! sale and auction on eBay. 
Among his acting resume are the films Eye for an Eye (1996, with Armin Shimerman, Natalija Nogulich, Nicholas Cascone, Wayne Pere, Sierra Pecheur, Angela Paton, Marie Chambers, Michael Buchman Silver, Bob Clendenin, David R. Maier, and stunts by Janet Brady and Gary Epper), Ivory Tower (1998, with Brian Reddy, Garrett Wang, and Time Winters), Storm in the Afternoon (1998, with Kavi Raz), Gun Shy (2000, with Greg Daniel, Louis Giambalvo, Aaron Lustig, and stunts by Scott Workman), and Pledge of Innocence (2001).
Janda also appeared in the video game Soviet Strike (1996, with John Marzilli, Sam Alejan, and Keith Szarabajka) and served as producer for the films Pledge of Innocence (2001), Solus (2006), and State's Evidence (2006).