Hussein began his teaching career at Lebanese University in 1990.

In October 2011, he was made the president of Lebanese University.

He also received a bachelor's degree in chemistry from Lebanese University.

From 1970 to 1985 he was professor of Arabic literature at the Lebanese University.

He finished his studies at the Lebanese University in 1966.

He became a prominent lawyer and taught at the Lebanese University.

Baydoun worked as mathematics professor at Lebanese University from 1976 to 1988.

He worked as a history professor at Lebanese University in Aley.

He taught in the college of law and political science at Lebanese University.

He acted as a part time professor at the Lebanese University from 1977 until 1981.