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.
- http://www.housestaff.net

International Butler Academy
- Offers training programs for butlers, household managers, and personal assistants.
- http://www.butlerschool.com/

Starkey International Institute for Household Management
- Offers training and placement of service experts in household and estate management positions.
- http://www.starkeyintl.com/