http://www.naces.org/

The Standard of ExcellenceNACES® is an association of private foreign educational credential evaluation services committed to formulating and maintaining ethical standards in the field of foreign educational evaluation.  Within the United States, no government agency monitors the establishment of foreign credential evaluation services.  NACES® was founded in 1987 by credential evaluation services dedicated to promoting excellence and committed to setting the standards for the profession.
Affiliation with a selective association such as NACES® is an important indication of the quality of work accomplished by a foreign credential evaluation service and an assurance that the evaluations it performs will be reliable.
NACES® members serve foreign-educated persons who have completed part or all of their education outside of the United States and who are seeking further education, professional licensure, or employment in the United States.  Foreign-educated persons are referred to NACES® member organizations by administrators in the United States who need to make a decision based upon an applicant's educational qualifications.  NACES® members provide expertise on the educational systems, institutions, programs, and documents of other countries.

http://www.naces.org/members.htm