garry@initialized.com

from his 2018 interview to hackernoon

garry@ycombinator.com

garrytan@gmail.com

from this filing

Garry's phone number (650) 796 95 01  or (415) 493 82 64.

photo source: https://www.flickr.com/photos/websummit/45700698642/, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=119011119