income Bussers are not traditionally tipped directly in the United States, but restaurants may employ "tip pooling" or "tip sharing" arrangements, in which a portion of servers' tips are shared with other restaurant service staff. In the United States, tip sharing may be either voluntary, where waitstaff give a portion of their tips to coworkers as they see fit, or mandatory, where the employer sets a formula by which tips must be shared with coworkers such as bussers and bartenders. Federal Department of Labor regulations do not allow restaurants to include managers in tip sharing, and inclusion of "back of the house" employees such as dishwashers and cooks has been the subject of legal disputes since 2009. Recipients of tips in shared tip restaurants may be paid a "tip-credit wage", below the ordinary minimum wage in the United States, if the amount of shared tips in a pay period brings their average pay to the minimum wage. Federal subminimum wage is set at $2.13 per hour, though state and local laws may require higher rates. California, for example, requires tipped employees be paid full minimum wage. A spokesperson for restaurant operator Darden Restaurants, which incorporated tip-sharing in 2011 at their Olive Garden and Red Lobster chains, said that it was more consistent and fair "to recognize everyone who delivers a guest experience", and noted that the lower hourly base wage for bartenders and bussers offered "the opportunity to ultimately earn more", depending on a restaurant's volume of tips. Notable former bussers Alec Baldwin, American actor, producer, and comedian, was a busser at Studio 54, a New York City disco. Arthur Bremer, American failed assassin of George Wallace in 1972, and whose diary became the basis for the movie Taxi Driver, was demoted from busser to custodian at the Milwaukee Athletic Club when he was caught talking to himself. Jacques Chirac, former President of France, worked as a busser and waiter in a Howard Johnson's restaurant while attending summer school at Harvard University. Bradley Cooper, American actor and producer, worked as a busser at age 15, as a prep cook in college, and starred as a chef in the film Burnt. Robert Downey Jr., American actor, worked as a busser at a restaurant in New York City for three years, was "too sweaty" to work as a waiter. Richard Feynman, American physicist, experimented with ways to optimize dish-stacking while working as