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Chief Petty Officer Miles Edward O'Brien, played by Colm Meaney, is a character in Star Trek: The Next Generation and Star Trek: Deep Space Nine. O'Brien was originally the transporter chief of the USS Enterprise-D. He was later promoted to Chief of Operations of Deep Space Nine, and he also serves on the USS Defiant which is operated from that space station. O'Brien is the only major Star Trek character described as both ethnically Irish and born on Earth in Ireland. Although not a member of bridge crew, he appears in over 50 TNG episodes, almost double the amount of Tasha Yar, and also more than semi-regular Ten-Forward confidant Guinan. On Deep Space Nine the character and his family's story continue, and he is reunited with Worf in Season 4 of Deep Space Nine. Miles is often shown working on the Space Station, hanging out with Bashir or other main cast members, or going on away-missions on Runabouts or the USS Defiant.