The following guests have been, or are scheduled to be, part of the Plus Four podcast.
| Last Name | First Name | Episode | Subject |
|---|---|---|---|
| Ahlschwede | Rob | 1 | SoHG Origins |
| Alpaugh | Tim | 4 | Innovation, Creativity & Metropolitan Hickory Society |
| Bone | Turner | 12 | Western Gailes and its archives |
| Brown | Dave | 10 | McIntyre Golf Ball Co. |
| Capers III | John | 3 | GHS & Club Archives |
| Ellis | Jeffery | 8 | The Clubmaker’s Art |
| Engelson | Lang Willie | 7 | Carolina Hickory Golf Assc |
| Geisler | Bill | 6 | Florida Hickory Golfers |
| Grunwell | Peter | 15 | Fine Golf Books of St Andrews |
| Grula | Richard | 6 | Florida Hickory Golfers |
| Hill | Roger | 1 | SoHG Origins |
| Howe | Angela | 14 | R&A World Golf Museum |
| Hudson | Deal | 9 | The Old Course and Fife |
| Lochhead | Andrew | 12 | Prestwick & Its Archives |
| Loudon | Alastair | TBA | Gentry Links: 19th Century Lore |
| Leonard | Kelly | 5 | Handcrafting Longnose Play Clubs |
| Moore | Tad | 1 | SoHG Origins |
| Morrisson | Michael | TBA | History of Golf in England |
| Nagy | Karl | 9 | The Old Course and Fife |
| Pilewski | Rob | 7 | Carolina Hickory Golf Assc |
| Quirici | Paolo | TBA | Swiss Hickory Golf |
| Schmidt | Richard | 7 | Carolina Hickory Golf Assc |
| Stevens | Mike | 6 | Florida Hickory Golfers |
| Sutherland | Hugh | 13 | Nairn Golf Club Archive |
| Williams | John Henry | 2 | Golf Club Restoration |