My condolences to his family and everyone who knew him personally, I'm truly sorry for your loss.
For those of us who never met him, it's a huge loss to the community. Let's make sure that his memory lives on by continuing to spread the word about quality audio and the contribution that Gary Stewart made to the field. May we all be so lucky as to find what he did: something you love and can devote your life and energy to. Rest in peace.