Jason Chandler is a character that was created for the unbuilt Disneyland concept Discovery Bay and early versions of Big Thunder Mountain Railroad. In recent years, however, he has been incorporated into the Society of Explorers and Adventurers storyline in the parks and appeared as a major character in Disney Kingdoms: Big Thunder Mountain Railroad. Jason Chandler was a 19th century inventor who was a member of the Society of Explorers and Adventurers. By 1851 he served as the club secretary under president of SEA Vitale Robustelli. At some point following this, Chandler would rise to the position of president of the society while continuing developing his own inventions. By the 1880s, he would begin selling this technology to the Big Thunder Mining Company for their operations in Big Thunder Mountain to assist his friend from SEA, Barnabas T. Bullion.
Jason Chandler was an inventor, who built a drill big and powerful enough to dig into the hardest of places. It attracted the attention of Barnabas T. Bullion, who bought it off of him to mine into Big Thunder Mountain. The two became close friends, going on expeditions together, exchanging letters, and visiting each other. However, Chandler was more cognizant of the troubles that would come with the mining, believing the stories about Big Thunder and urging his friend to stop before it was too late.
Chandler joined the Society of Explorers and Adventurers in the mid-1800s, as a secretary as early as 1851 and later as a chairman. He went on expeditions with other members, including one with Captain Brieux on the Hyperion ship to chart flying animals.
Growing up in Los Angeles in the 70s/80s we visited Disneyland on a regular basis and often after school, before "Annual Passes".