* Through his management: You can try to contact his management company, but they likely won't pass on personal messages.
* Social media: He's active on Instagram (@gublergram) and Twitter (@GublerNation). While he might not read every message, you can try reaching out to him there. Be mindful of his privacy and keep your messages respectful.
* Fan conventions: If he's attending any conventions, this could be an opportunity to meet him in person and possibly get an autograph.
Remember, celebrities receive a lot of messages, so don't expect a reply. Just enjoy connecting with him through his work and his online presence.