Association of Theological Schools in the United States and Canada

The Association of Theological Schools in the United States and Canada (ATS) is an organization of seminaries and other graduate schools of theology. It is based in Pittsburgh, Pennsylvania and has over 250 member schools.

From the ATS website:
 * The Association of Theological Schools in the United States and Canada (ATS) is a membership organization of more than 250 graduate schools that conduct post-baccalaureate professional and academic degree programs to educate persons for the practice of ministry and for teaching and research in the theological disciplines. 
 * The mission of The Association of Theological Schools in the United States and Canada is to promote the improvement and enhancement of theological schools to the benefit of communities of faith and the broader public.

The ATS runs the Commission on Accrediting, which provides accreditation for graduate schools of theology. The Commission is made up of all member schools which are themselves accredited or are candidates for accrediting.

Requirements
Schools accredited by Association of Theological Schools in the United States and Canada requires one to complete 3 years of full-time ministry after the initial theological degree, normally the Master of Divinity (M.Div.) before entering any Doctor of Ministry program.