Rubuta ci gaba don wannan sakin layi - An haifi O'Brien a Jersey City, New Jersey, a ranar 7 ga Maris, 1879. Ya halarci Makarantun Jama'a na Jersey City, Kwalejin Kwalejin St. Aloysius da Kwalejin Saint Peter. Ya kammala karatunsa daga Jami'ar Fordham. Ya yi karatun doka a Makarantar Koyon Shari'a ta New York, an shigar da shi cikin mashaya kuma ya fara aiki a Jersey City. Ya kasance alkalin kotun aikata laifuka ta biyu, kuma shi ne darektan tsaron jama'a na Jersey City daga 1917 zuwa 1921. Ya kasance wakili ne a Babban Taron Kasa na Jam'iyyar Democrat na 1920
Ka yi haƙuri.