Kier attended Spotswood High School. In his career, he scored 1700 points for Spotswood and earned Valley District Player of the Year honors. He committed to George Mason over scholarship offers from Coastal Carolina, UNC Greensboro, Radford and Fairfield.
Kier made an immediate impact at George Mason as a freshman, averaging 5.8 points and 4.5 rebounds per game. He averaged 11.0 points, 4.6 rebounds and 2.3 assists per game as a sophomore. On December 3, 2018, he scored a career-high 32 points in a 72–67 loss to Vermont. As a junior, Kier averaged 14.5 points and 6.5 rebounds per game while shooting 47.1 percent from the field. He was named to the Second Team All-Atlantic 10 as well as the Atlantic 10 Most Improved Player. He suffered a stress fracture in the offseason that caused him to miss the first six games of his senior season. Kier missed a game with an unrelated injury in December 2019. On January 15, 2020, he reinjured his stress fracture which caused him to miss the remainder of the season. In nine games, he averaged 9.6 points and 3.6 rebounds per game.
On April 8, 2020, Kier decided to enter the transfer portal after being granted a fifth season of eligibility. He announced he was transferring to Georgia on April 26 and will be eligible immediately as a graduate transfer. Kier chose the Bulldogs over offers from Minnesota and NC State. He averaged 9.5 points, 3.7 rebounds, 2.4 assists and 1.7 steals per game while shooting 39.4 percent from the field. Kier transferred to Arizona Wildcats for his final season of eligibility. Kier led his team to the Sweet 16 in the 2022 March Madnes, where they lost to the Houston Cougars 72 - 60.

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