Marty is Rick's younger brother, who has always admired him. Although he has shared Rick's interest in Oak Island since childhood, he is somewhat skeptical that anything was ever really buried there. He wants verifiable evidence that large-scale work was done on the island before the first treasure hunt in 1795, and he also worries that Rick could fall victim to an obsession with the island, as many have before him.

Nevertheless, it is mainly Marty who finances this adventure. He is an engineer who made millions in the energy business, and now he wants his older brother to realize his dream as well.