 From 1996 to 1997, he was at the University of Lagos where he obtained a Masters at laws degree.He obtained his postgraduate Diploma in Management from the University of Calabar in 2001 and his masters of Business Administration from the University of Calabar in 2002.In 1992 Onoja started his legal career with the firm of Humphrey Abah & Co before he set up his first private practice, Onoja Consulting Solicitors, in 1994.