Paul AllenPaul Allen.Getty

Some of the most prominent tech leaders on the planet have paid tribute to Paul Allen, the cofounder of Microsoft who died on Monday at the age of 65. 

Amazon CEO Jeff Bezos, Apple CEO Tim Cook, and Google CEO Sundar Pichai were among those to celebrate the mark that Allen left on the tech world. 

He died from complications relating to non-Hodgkin’s lymphoma, a cancer he was first diagnosed with in 2009. Allen disclosed earlier this month that it had returned after a period of remission.

Scroll on to see how tech leaders responded to news of Microsoft cofounder Paul Allen’s death.