Moldauer was born in Seoul, South Korea and was adopted by Peter and Orsa Moldauer before he was one year old. He has three siblings, Leah, Sorcha and Sundo. He grew up on a farm in Colorado, and attended Golden High School. He is currently a student at the University of Oklahoma where he majors in finance. At age seven, Moldauer joined a local gym offering a free tryout, and at age ten, he joined 5280 Gymnastics, where he was coached by the Artemev family. In the next few years, he started winning state and regional meets, and eventually won a place on the Junior National Team.
Junior career
In 2014, Moldauer won the junior title on the pommel horse at the U.S. National Championships. In 2015, he won the gold medal in the 18-year-old age division at the Junior Olympic National Championships. In 2016, Moldauer won his first NCAA all-around title.
Senior career
2017
Moldauer competed at his first top level international competition in March at the 2017 American Cup in Newark, New Jersey, where he placed first ahead of Olympic gold and silver medalistOleg Vernyayev. Later that year, he became the NCAA champion on the floor exercise and rings, and placed second in the all-around and on parallel bars. In August, Moldauer won the all-around national title at the 2017 U.S. National Championships in Anaheim, California, and tied for the gold medal with Eddie Penev on floor exercise. Moldauer made his first World Championship appearance at the 2017 World Championships in Montreal, Canada. He won the bronze medal in the floor exercise final and placed 7th in the all-around final.
2018
Moldauer won his second consecutive American Cup all-around title in March at the 2018 American Cup ahead of more accomplished gymnasts including Kenzō Shirai of Japan, the 2017 World all-around bronze medalist, thanks to Moldauer achieving a top three score on every apparatus. In August at the 2018 U.S. National Championships, he won the silver medal in the all-around behind Sam Mikulak. In October, Moldauer competed at the 2018 World Championships in Doha, Qatar. He and the U.S. team finished fourth in the team competition. He went on to place 12th in the all-around final and fourth in the floor exercise final.
2019
Moldauer won his third consecutive American Cup all-around title in March at the 2019 American Cup, just 0.001 of a point ahead of fellow American Sam Mikulak. In August at the 2019 U.S. National Championships, he again won the silver medal in the all-around behind Sam Mikulak. Additionally, he won silver medals on floor exercise and parallel bars.
2020
Moldauer competed at the Winter Cup Challenge in Las Vegas, finishing first on vault, third on parallel bars, fourth on pommel horse and fifth all-around. Due to his results at the Winter Cup Challenge, he was named to the 2020 senior men's team.
