Every Thursday morning between 9 a.m. and 10 a.m on Pittsburgh Today Live on KDKA Channel 2 in Pittsburgh.
See Doug's previous segments here.
Every Sunday morning at 7 a.m. on KDKA Radio 1020AM (OK you can't see him, just listen). There's more information
On The Web-
Catch Doug's weekly video series "Digging with Doug" at The Pittsburgh Post-Gazette's web site. Click on Multimedia, then Digging with Doug.