I'm a huge fan of Jonathan Frakes (especially of Star Trek TNG) and so I thought I'd give it a try and sent a LOR, a SASE and a photo.
Two days ago I received it back signed and personalized. Needless to say I couldn't have been happier.
Address used:
Jonathan Frakes
Cast & Markay Business Management Inc.
1901 Avenue of the Stars
Suite 900
Los Angeles, CA 90067
USA
Sent: 06/07/2019
Received: 03/06/2020
Favourite TTM autographs: David Tennant, Judi Dench, Jonathan Frakes, Geoffrey Rush, Jackie Chan, Patrick Stewart, Tony Anselmo, Jimmy Carter, Ian McKellen