(written from a Production point of view)
Michael Canavan is the actor who appeared in three episodes of Star Trek television series. His unfinished costume from the episode "Unforgettable" was sold off on the It's A Wrap! sale and auction on eBay. 
Canavan is married to fellow Star Trek guest actress Shannon Cochran. In a StarTrek.com interview, Cochran mentions they married because he was the only other person, aside from Jonathan Frakes and Nana Visitor, she filmed the episode "Defiant" with.
He has enjoyed small roles in the feature films Hidalgo and Murder By Numbers. His television credits include a recurring role on 7th Heaven, as well as guest appearances on Alias, CSI: Miami, The West Wing, and The X-Files.