The Trump Organization is the collective name for a group of approximately 500 business entities of which Donald Trump, the current U.S. President, is the sole or principal owner. Around 250 use the Trump name. Founded in 1923, by Donald Trump's grandmother and father as E. Trump & Son, Donald Trump led the organization between 1971 and 2017, as both chairman and president. The Trump Organization, through its various constituent companies and partnerships, has or has had interests in real estate development, investing, brokerage, sales and marketing, and property management. Trump Organization entities own, operate, invest in, and develop residential real estate, hotels, resorts, residential towers, and golf courses in various countries, as well as prime Manhattan real estate. They also operate or have operated in construction, hospitality, casinos, entertainment, book and magazine publishing, broadcast media, model management, retail, financial services, food and beverages, business education, online travel, commercial and private aviation and beauty pageants.