2008-09: Michalek earned his first varsity letter for the Loomis-Chaffee School in Connecticut as a sophomore.
2009-10: Michalek was named the Team MVP for the Loomis-Chaffee School and was one of the busiest goalies in the New England Prep School League as the Pelicans finished 3-18 during the season. Michalek was selected to participate in USA Hockey's Select 17 Festival.
2010-11: Michalek skated for Team USA at the 2010 Ivan Hlinka U18 Tournament in Slovakia before returning to Loomis-Chaffee for his senior season. He started three games for Team USA and in the championship game stopped 23 of 24 shots, allowing only a first period goal by Ryan Nugent-Hopkins, in the USA's 1-0 loss. In 23 games for Loomis-Chaffee he finished 2-19-2 with a 3.95 GAA and .918 save percentage. Michalek committed to playing college hockey at Harvard and was ranked 5th amongst North American goalies in Central Scouting's final rankings.
2011-12: Michalek appeared in 24 games for Harvard and was named to the ECAC All-Rookie team as a freshman. He was 7-7-8 with a 3.19 goals against and .894 save percentage. The Crimson finished third in ECAC Hockey and advanced to the ECAC tournament championship game. After getting off to a fast start, Michalek's play leveled off a bit in the second half and sophomore Raphael Girard handled the goaltending for Harvard in the post-season.
A workhorse at the prep level, Michalek has good size and fundamentals at an early stage.
A freshman at Harvard University, Michalek has assumed the starter's role.