Cassels joined Performance Tech for a chance at pure racing. Cassels comes from the IMSA Continental Tire SportsCar Challenge series where he raced the Porsche Cayman. He finished second in the GS class. Cassels won the 2019 IMSA MICHELIN Endurance Cup, punching his ticket to the renowned 24 Hours of Le Mans. In 2020 he is set to run a full season in IMSA Prototype Challenge in the No. 75 NorCan Electric LMP3 as well as the IMSA WeatherTech SportsCar Championship in the No. 38 Centinel Spine ORECA LMP2.