Professor Gerrit, known as Dr. Guerit in certain regions, acts as Alfred Jones's remote academic mentor. Operating from an undisclosed location, he delivers vital intelligence and guidance to the treasure-hunting team by transmitting encoded instructions via gramophone records. These records detail historical artifacts and their potential locations, enabling Montana Jones, Alfred Jones, and Melissa Thorn to undertake their expeditions. His involvement occurs entirely off-screen throughout the series. A later narrative revelation identifies Professor Gerrit as Melissa Thorn's father, explaining her consistent presence and strategic support for the team's missions. His character, confined to this off-screen facilitator role, drives the central plot through academic expertise and this paternal connection. No official media beyond the original 52-episode series expands his background, development, or depiction.