
Robert Picardo is well-known in the Star Trek Universe for his portrayal of the Emergency Medical Hologram Mark I and all of it`s variants on both Voyager and Deep Space Nine - as well a the Enterprise-E EMH in the feature film First Contact. Much like Brent Spiner, Picardo also played the creator of his main character, Dr. Lewis Zimmerman - also on both Voyager and Deep Space Nine.
Over in Stargate Land, Picardo is Richard Woolsey, who was rather unlikable at first - but ended up being a pretty great character. He would appear as Woolsey on seven episodes of SG-1, and 26 times on Atlantis - where at one point would take command of the expedition to the Pegasus galaxy.
Those `Trek episodes where the Doctors sings opera? Yeah, Picardo can really do that. Oh yeah, he`s from Pennsylvania!