- International Butler Academy - Offers training programs for butlers, household managers, and personal assistants.
- International Household Manager - Information on household managers, estate managers, majordomos, butlers, executive housekeepers, personal assistants.
- Professional Domestic Services & Institute - A training facility and placement agency for household service staff, including household managers, personal assistants, and butlers. Located in Columbus, Ohio.
- Starkey International Institute for Household Management - Offers training and placement of service experts in household and estate management positions.
