Paul Allen, the philanthropist and co-founder of Microsoft, died Monday in Seattle from complications of non-Hodgkin's lymphoma. He was 65. In a statement, his sister, Jody, said Allen was "a remarkable individual on every level." Microsoft CEO Satya Nadella said Allen "created magical products, experiences, and institutions, and in doing so, he changed the world." He founded Microsoft in 1975 with Bill Gates, and after leaving the company, founded Vulcan, Inc, which oversaw his philanthropic and business endeavors. One of the world's wealthiest people, Allen's net worth was estimated at more than $20 billion.