I couldn't find a way to contat the Custom Visualization author other than this. I think visjs.org may be a great candidate to further expand it.
And btw, great job.
@marios_kstone We can attempt to summon @skawasaki_splunk by mentioning him like that. But as you asked a question and tagged it with the app tag he should have already gotten a notification that a question was asked about his app.
You can contact the author by visiting their profile page (http://answers.splunk.com/users/192442/skawasaki_splunk.html) and getting their email from there.
@alacercogitatus Only moderators ♦ and admins ♦♦ can see email addresses
Actually there is no email and there is no way of sending personal messages from there... tried that