Its members have included many recipients of the Nobel Prize, Pulitzer Prize and Presidential Medal of Freedom.
Since 1887, the regular meeting place of the Philosophical Society of Washington has been the assembly hall of the Cosmos Club, now called the John Wesley Powell auditorium. The National Geographic Society was founded in the Cosmos Club in 1888.
For its first 110 years, the Cosmos Club did not permit women members, and forbade female guests to enter by the front door or to enter rooms reserved for members. In 1988, the Washington D.C. Human Rights Office ruled that there was probable cause to believe that the club's men-only policy violated the city's anti-discrimination law. The Office was ready to order public hearings on the case, which could have resulted in the loss of all city licenses and permits if the all-male policy had continued.