[3] In 2022, Casselly joined the lineup of the World Christmas Circus [de] in Stuttgart,[4] and in 2023 he performed at the International Circus Festival of Monte-Carlo with Merrylu Casselly and Quincy Azzario and was awarded the Clown d'or (Golden Clown) award.

[5] René competed in both the German and Japanese Ninja Warrior shows.

He won in 2021, becoming Germany's first ninja warrior to complete the last obstacle, the famous Mount Midoriyama.

[7] In the spring of 2022, René took part in Let's Dance (German season 15) and was paired up with Kathrin Menzinger.

[2] His cousin is schlager singer Ramon Roselly, the winner of Deutschland sucht den Superstar (season 17)[10]