Born in Amman, Jordan, 1960. Ammar graduated with a Bachelors degree from the University of Southwestern Louisiana and later completed his Graduate studies in 1988 from Yarmouk University in Irbid, Jordan.

 Khammash is known in Jordan for his cultural and environmental preservation work, in which he uses local and natural materials. One recent project, the Feynan Ecolodge hotel in Jordan's Dana Biosphere Reserve, has won four international awards for sustainable development since it opened in 2005. He is also the architect of ‘Wild Jordan’ the recent headquarters of the RSCN in Jabal Amman.