Certified Genealogical Lecturer (CGL)
From Ancestry.com Wiki
CGL is the abbreviation for Certified Genealogical Lecturer.
The postnominal of CGL is administered by the Board for Certification of Genealogists®. The Board also administers the Certified Genealogist (CG) certification.
Previously, the Board offered credentials of Certified Lineage Specialist (CLS), Certified American Indian Lineage Specialist (CAILS), and Certified Genealogical Records Specialist (CGRS), and Certified Genealogical Instructor (CGI). These credentials are no longer current, but you might see them in older publications.
To learn more about becoming a Certified Genealogical Lecturer, visit The Board for Certification of Genealogists website.