Reuben is a notary by profession. He graduated from the University of Malta with a Bachelor of Arts in Law and International Relations in 2001, and a year after he obtained the Diploma of Notary Public.
He then obtained the LL.D in 2004 and in the same year obtained the warrant to practice as a Notary. Reuben set up the Notarial Firm named D Notaries and the same firm has published more than 6,000 contracts mostly in real estate transactions. D Notaries provides all notarial services including property conveyancing, financing and mortgaging, estate and succession planning and also acting as Commissioner for Oaths. He was awarded a certificate in trust law and administration by the Institute of Financial Services Practitioners Malta.