Solomon first began formal track training in 2009, and that year he won the Under-17 All-Schools Championship in the
400m. Solomon competed for Australia in the
Maccabiah Games, the "Jewish Olympics", as captain of the junior soccer team at the
2009 Maccabiah Games. He was named the 2009
Maccabi New South Wales Junior Sportsman of the Year. He won the 2011 Australia National Championship in the 400m at 17 years of age. He was the first Australian man in 24 years to reach the 400m final at the Olympics. Solomon competed for Australia again as captain of the junior soccer team at the
2013 Maccabiah Games. At Stanford in 2013, he established a new freshman record in the 400 with a 46.12 (No. 3 on the school's all-time list), and was named a second-team All-American. In 2014, he set a new Stanford record in the outdoor 400m while winning the Australian national championship, running 45.36, and also finished second at the
Pac-12 Championships in a time of 45.79. Solomon just missed the qualifying time to represent Australia at the
2016 Olympic Games. The cut-off was 45.40, and he missed it by one-10th of a second. In April 2017, he won a record-tying fifth Australian National Championship in the 400m, in a time of 46.66 in wet conditions. He finished the season as first team All-ACC, and a second team All-American. After the Olympics were postponed, he maintained competitive training with his coach
Penny Gillies, a former 100m Olympic hurdler. Solomon competed in the
400m at the
2020 Summer Olympics, held in early August 2021 in Tokyo, Japan, setting a PB of 44.94 in his heat in making the semi-finals wherein he finished fourth in his heat in 45.15 (13th overall in the semifinal times). He also competed in the
400m at the
2022 World Athletics Championships held in July at the Hayward Field in Eugene, USA but didn't advance from the heats. ==Achievements==