The founding details of an organization depend on which organization you are asking about. Here are examples for some notable organizations:

• The World Health Organization (WHO) was founded when its Constitution came into force on April 7, 1948. The idea was proposed during the formation of the United Nations in 1945, and the Constitution was adopted on July 22, 1946, by representatives of 51 UN member states and 10 other nations

• The National Organization for Women (NOW) was founded on June 30, 1966, by a group of activists led by Betty Friedan, who became its first president. The founding was inspired by the Civil Rights movement and aimed to end sex discrimination

• The Organization of American States (OAS) was established in 1948 with the signing of its Charter in Bogotá, Colombia. It is the oldest regional organization in the world, with origins tracing back to the First International Conference of American States held from October 1889 to April 1890

• The African Union (AU) was officially launched in July 2002 as a successor to the Organisation of African Unity (OAU), which was founded in May 1963 by 32 independent African states meeting in Addis Ababa, Ethiopia

• The Conn Memorial Foundation was founded in 1954 by Fred K. Conn

If you specify the organization you are interested in, I can provide the exact founding date and founder(s).