You can look up contact information on
https://whois.icann.org You can look at the website for the domain if one exists and look for a 'contact' page
You can email 'admin@[domain]' and he will receive your email if he has a mailserver setup and monitors that email
Yea I did that but got nothing, I even hired a domain agent to help me contact him and buy it back twice but got no response.
The past websites he had connected with the domain include some type of weird child porn stories, black market pharmaceuticals, and pirated warez. I thought about reporting the domain to Enom where it is registered with but I doubt they will do anything because that was at least 3 years ago.