His email is, indeed, in his personal website. If you follow his KeyBase profile at https://keybase.io/am you will find a link to his website http://adrianmacneil.com/ which contains multiple links to his online persona, including his email address: \u0061\u0064\u0072\u0069\u0061\u006e [at] adrianmacneil.com

Thanks, I didn't actually realize that HN asks for your email but doesn't display it anywhere. Anyway, it's just adrian@getcruise.com.