Ziemer joined the University of Minnesota for his freshman year, scoring 12 goals and 23 points in 38 games. Throughout the campaign, he continued to improve his skills as a two-way, tenacious energy player. He finished seventh in scoring with the Gophers. At the 2025 World Juniors, Ziemer helped Team USA win gold, scoring three goals and seven points in seven games.

Ziemer was a key part of Team USA’s gold medal, finishing fourth on the team with seven points in five games. He played with Gophers teammate Oliver Moore (CHI) as well as NYI prospect Danny Nelson. – Dobber

Ziemer was selected 71st overall by Buffalo.

Ziemer’s a guy that just always seems to be at the right place at the right time. Pause a frame of any game and he’s in or getting in position. He’s got a great map of the ice and really pairs well with intelligent players. He’s quick to respond to changes in play and is able to recognize and act on his options really quickly. To the camera, he can feel omnipresent. Ziemer’s also got really fast hands that lend to a quick release and a tough to avoid forecheck. I don’t think his individual skill is over the moon, but there’s something to be said for someone as instinctively wise as Ziemer carving out some real top 9 upside. He just gets it. David Saad