He first competed in American Ninja Warrior 2 as the final runner of the day. However, despite the cold temperature, he blazed through the course, beating the qualifier in the second fastest time of 40.52 seconds despite missing a try at the Warped Wall. In the Semi-Finals, his run was digested, but it was shown that he shockingly failed on the Salmon Ladder like many that day, as he lost his grip after attempting to swing and readjust his grip at the same time (in a similar fashion to Nagasaki Takamasa in SASUKE 18). He placed 19th overall, and did not make the cut-off for Boot Camp.
In American Ninja Warrior 3, David returned to compete in the qualifying course, with many expecting him to be the first clear of the day. He almost slipped off the beginning of the Log Grip due to rushing, but managed to recover. However, in a major shock, he attempted to go one-handed on the Jumping Bars and forgot about the added distance between the bars, causing him to fail to get a grip on the second bar and slip back into the water.
In American Ninja Warrior 4, David started strong, but started to lose stamina on the Devil Steps and he didn't have enough energy to scale the Soritatsu Kabe. Despite this, his time past the Devil Steps was good enough to scrape into the semi-finals in 30th place. In the semi-finals, David managed to take revenge on the Devil Steps, Soritatsu Kabe, and even the Salmon Ladder, but he didn't have enough strength to get past the Arm Rings and failed the obstacle, placing 17th overall. However, he had a chance to attempt the Vegas course due to Seddrick Bassett withdrawing from the competition. During his run, he started strong, he began to lose stamina after the first four obstacles, struggling for a long time at the Warped Wall. He later timed out on the Rope Ladder about halfway up. Nevertheless, he was satisfied with his performance.
In American Ninja Warrior 6, he competed alongside his twin brother Paul Money. In Venice, he started out strong, but much like in American Ninja Warrior 4, he became fatigued on the fifth obstacle (the Monkey Peg) and unlike Season 4, failed the obstacle, the same place where Paul fell. But, it was good enough to make it in the top 30, where he placed 23rd. In the Venice Finals, his run was digested, but it was shown that both him and Paul failed the obstacle a second time, which was not good enough for Vegas. He hasn't competed since.
|4||2||Failed Rope Ladder (First Stage)||Time Out.|