An automatic vouch for being a former Mozilla employee.
Jonathan was the best intern I could as for during my time designing Firefox Metro. He impressed the team wit his strong engineering skills, smart product design ideas, dedicated work ethic, and many fuzzy stuffed animals he collected :)
Jonathan was an awesome intern at Mozilla, and I can't vouch for him too strongly. Great design skills, excellent engineering, and has a cool unicorn to boot.
Jonathan and I have worked together on a few tech projects. He walks and talks like a seasoned champion for the open web at least ten years older than he actually is. His enthusiasm, experience, and support have helped me gain the confidence I've needed to step up in my own activities within the Mozilla.