Entrepreneurs' Organization (EO)FOUNDED: 1987. MEMBERS: 6600. MEMBERSHIP DUES: individual, $1,300 annual. STAFF: 50. BUDGET: $8,000,000. REGIONAL GROUPS: 4. LOCAL GROUPS: 65. NATIONAL GROUPS: 38. MULTINATIONAL. DESCRIPTION: Entrepreneurs under the age of 50 who have either founded, co-founded, are a controlling shareholder of, or own a firm with annual gross revenues exceeding $1,000,000 (membership is by invitation only). Engages leading entrepreneurs to learn and grow. Serves as a focal point for networking and development o