Joseph has over 38 years of experience employed in various capacities within the financial industry in the U.S and in Malta. He has experience as a portfolio manager, currency, and futures trader, and has worked with Bank of America, Nomura Securities, Goldman Sachs, Millburn Ridgefield, and Liongate Capital Management. He was also chief investment officer and managing director of FMG Funds, an emerging markets specialist.

He is currently the Executive Chairman of the Malta Stock Exchange and sits on its Audit Committee. Between April 2013 and April 2015 he sat on its board and chaired its Risk Management Committee. In 2015 he was named executive chair of the Malta Stock Exchange PLC and has founded and chairs various MSE-owned subsidiaries such as the Malta Stock Exchange Institute amongst others. He also offers risk management consulting, and sits on the boards and investment committees of numerous asset management and financial service companies domiciled in Malta. Joseph also sits on the Malta Financial Services Advisory Council a board, constituted by the Finance Ministry of Malta and is chairman of the World Federation of Exchanges, Governance and Nominations Committee.

Joseph was also a visiting lecturer at the University of Malta and has taught courses at the Malta Institute of Accounting, and other institutions. He was a regular contributor to the Times of Malta, writing about investor education. Joseph graduated with a BA from Baruch College, City University of New York.