Mousa is the oldest son of late Michel Sindaha the founder of the firm. After graduation from California State University Beach in 1982, he joined his father to work as a junior accountant. He was qualified to JCPA in 1984 and promoted to partnership. While working and serving the army Mousa got a degree in Law from Beirut Arab University in 1985.

In 1992 Mousa took the CPA exam from the state of Montana USA. He has a license to practice in Montana as well as Jordan. Mousa worked on the training and development of the firm employees; and served as the Chairman of the Training Committee of the Jordan Association of CPA’s (JACPA). In 2003 to 2006 Mousa serve as a member of the board of the JACPA. Mousa is the treasurer of JACPA from 2011 to 2014. As of January 1st 2014, Mousa is a member of the Compliance Advisory Panel (CAP) a committee of International Federation of Accountants (IFAC), he was re-elected and his term will finish by the end of 2019

In the community service, Mousa served as a past president of Rotary Club of Amman Jerash. He has several articles and speeches about Rotary History in Jordan, Palestine and the Middle East. 

Mousa has many interests specially in history where he wrote several research papers in history.