Following internships during his undergraduate studies with Eurobank EFG Shipping Unit where he specialised in ship financing, and in the insurance and operations department of a ship management company, both in Piraeus, Haris then attended the University of Leeds, where he graduated with distinction from the MSc in International Business course. He joined Gallagher in London in 2013 and was part of the Marine Team as a Hull and Machinery broker and Associate Director, focusing on the Greek and North European markets, where he stayed until mid- 2019.
In December 2020 having completed his full- time MBA from HEC Paris he returned to Greece and since February 2021 is the Head of Marine for AON Greece overlooking the Marine Operations.