Captain O'Brien is a fictional character from the television series Star Trek: Deep Space Nine. He serves as the chief of operations on the space station, overseeing various technical and engineering tasks. O'Brien is known for his expertise in machinery and his ability to solve complex problems, often under pressure. Throughout the series, Captain O'Brien is portrayed as a loyal and dedicated officer, balancing his professional duties with his personal life. He is married to Keiko O'Brien, and they have a daughter named Molly O'Brien. His character is well-regarded for his strong moral compass and commitment to his crew.