Mary-Kate Fisher is a former political appointee who served as Acting Chief of Protocol of the United States from June 24, 2019, to August 12, 2019.

She began her career as a scheduler in the office of New Jersey Governor Chris Christie, but later joined a non-profit organization.

She also served as deputy director of the Hurricane Sandy New Jersey Relief Fund, which was created by Christie's wife.

[3] On June 24, 2019, Fisher took over as Acting Chief of Protocol when Sean Lawler was suspended indefinitely as a result of an investigation into his conduct.

Lawler was scheduled to join President Donald Trump on his trip for the G20 summit in Japan later that week, but due to his suspension Fisher was asked to go in his place.