Nassar was the first Jordanian to obtain the traditional Ijaza in calligraphy from the Islamic world's premier master calligrapher, Hasan Çelebi, in 2003, Istanbul.
[citation needed] Nassar started his academic career straight after graduation as a lecturer (1988-1995) of Arabic Calligraphy at the Faculty of Education and the Language Centre at the University of Jordan.
In 1998, he became a member of Al-Balqa` Applied University in Jordan where he contributed to the Institute of Traditional Islamic Arts setting up in 1998.
This institute was responsible for the reconstruction of the twelfth-century Saladin's pulpit (minbar) (منبر صلاح الدين) which was later in 2006 installed in its original place at al-Aqsa Mosque in Jerusalem.
His works are not limited to ink on paper, they extend to other media such as stone, ceramic, mosaic, glass, wood, metals and more.