As a former "Buckeye" myself (Queen City) let me also recommend Bryan Bilinski at Traverse City, MI-- He and the late Mike McIntosh had a great shooting school for years there, and it is still in operation with Bryan- a former Orvis Shooting Instructor.
Another suggestion- if that fine inherited Parker is a higher grade than a Trojan or a Vulcan series, remember that many of the older Parkers were made with more drop at both heel and comb, possibly also a shorter pull length, and more down-pitch (the Trap and Live bird special order guns a possible exception here)--
If I may make so bold as to suggest this- before you have a possible valuable older family heirloom Parker "altered" to fit your shooting needs and physical make-up, as to height, sleeve length, right or left eye dominance, etc- Buy a used 20 gauge Parker Repro- with TWO TRIGGERS- avoid the single selective trigger version- and work with that- and keep the family gun unaltered for at least two years-then decide- alterations to the Japanese copy of the original Parker guns are fine for field work, but they do not have the "investment" cache of the Meridan built Parker guns, IMO anyway--
You might want to join the Parker Collectors Forum as well- I believe they have a listing for the fine Repro Parkers and there are some members there who, I am sure, could also help you and steer you in the right path-
Fieldsport contact data:
www.fieldsportltd.com Traverse City, MI 49696 phone is 231-933-0767
You stated NE Ohio in your profile- Anywhere near Sylvania perhaps?? My first wife was from that area- And I was thrilled to see Ohio State beat arch rival U of M Saturday- My all-time favorite Big Ten College team is, of course, Notre Dame, but Ohio State looks unstoppable this season--