Starkey International Institute for Household Management
Offers training and placement of service experts in household and estate management positions.

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.