He attended Grand Lycee Franco-Libanais following which he earned a BA in Economics from Panthéon-Assas University and an MBA from ESA Beirut.

[1][2] Under his leadership, the Ministry of Telecommunications (1) upgraded antiquated copper backbone to fiber optics and DWDM latest technologies with plans ready for FTTC and FTTB, (2) replaced ancient EDGE cellular networks with 3G across the country and 50 Mbit/s 4G LTE in greater Beirut, (3) and increased Lebanon's international bandwidth tenfold via IMEWE whilst securing redundancy through participation in the Alexandros submarine cable; all while reducing internet & mobile costs by over 80%.

Sehnaoui is now leading Lebanon's Digital Roadmap Steering Committee to ensure the successful implementation of BDL C331.

All these efforts where measured & confirmed by the United Nations International Telecommunication Union that ranked Lebanon 1st in progress out of 157 countries in the 2012 ICT Development Index (IDI).

In 1991, and alongside Georges Corm, Borhane Alaouie, Karim Kobeissi and Abdel Rahman Ghandour, Sehnaoui co-founded the Lebanese Citizen's Movement that militates for a secular Lebanon.