MacKenzie Scott’s family office is called Lost Horse LLC—a Seattle-based vehicle set up in late 2019 that oversees her philanthropic donations, among other projects. 

It is run by president Carlos Rodrigues, who joined in mid-2020 after serving as a top executive at the family office of Josh Harris.

Other key aides at her family office who have been involved in communicating with nonprofits include Judy Wang and a philanthropic consultant named Hillary Chen.