Bassil started his career in the banking sector in 1962 by contributing to the establishment of Byblos Bank S.A.L. and became chairman and general manager of the bank in 1979.[13] He then lead the success and growth of Byblos Bank in Lebanon, transforming it from a mid-sized locally based entity to one of Lebanon's top three banks,[14] with total assets of USD 19 billion, and customer deposits reaching USD 15.7 billion as of 31 December 2014.[15]