He served more than 20 years with the AICPA. He was COO and SVP for from 2005 through May 2016 and became EVP of membership, technology and learning in July 2016 of the Association of International of CPAs, a joint venture of the American Institute of CPAs and Chartered Institute of Management Accountants
Doon joined the society as COO in 2005 and became CEO in 2006.