The billionaire co-founder of Microsoft, Paul Allen died on Monday. He died on the 15th of October, 2018. The cause of his death has been identified to be cancer.

He was an investor, entrepreneur and philanthropist. Allen has influenced many aspects of modern life. He has left his mark on technology, science, sports and music. His death was announced by his investment firm, Vulcan. He died in Seattle from complications related to non-Hodgkin’s lymphoma. This happened two weeks after Allen had announced that he was being treated for the disease.

Jody Allen, his sister, said in a statement, on behalf of the family, “My brother was a remarkable individual on every level. He was a much-loved brother and uncle, and an exceptional friend.”

Allen founded Microsoft with Bill Gates in 1975. The two had met as fellow students at a private school in Seattle. He left the company in 1982 after he was diagnosed with Hodgkin’s disease.

Bill Gates said in a statement, “I am heartbroken by the passing of one of my oldest and dearest friends, Paul Allen. Paul was a true partner and dear friend. Personal computing would not have existed without him.”

Satya Nadella, Microsoft’s CEO, called Allen’s contributions “indispensable”. Nadella also added, “As co-founder of Microsoft, in his own quiet and persistent way, he created magical products, experiences and institutions, and in doing so, he changed the world.”

Apart from his contributions to the field of technology, Allen was also a huge philanthropist. He was worth $20.3 billion at the time of his death, according to Forbes. Paul Allen donated more than $2 billion to charity. He founded several organizations. This includes the space transportation company Stratolaunch, the Allen Institute for Artificial Intelligence and another Allen institute that focuses on bioscience.

The death of Paul Allen is truly a blow to the progress of the world. His life was exemplary and his contributions limitless.