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 |
| Capers III | John | 3 | GHS & Club Archives |
| Hill | Roger | 1 | SoHG Origins |
| Leonard | Kelly | 5 | Handcrafting Longnose Play Clubs |
| Moore | Tad | 1 | SoHG Origins |
| Palmer | Colin | 7 | Valuing Memorabilia Collections & Glenna Collett Vare |
| Quirici | Paolo | 6 | Swiss Hickory Golf |
| Williams | John Henry | 2 | Golf Club Restoration |