2009-10: Mike Williamson made his debut in junior A hockey, playing four games with the Drayton Valley Thunder in the Alberta Junior Hockey League ,and played for the Schwab GM Oil Kings midget AAA team in his hometown of Leduc. Williamson had no points or penalty minutes with the Thunder. He scored 7 goals with 3 assists and had 72 penalty minutes in 31 games with the Oil Kings. Schwab GM reached the Dodge Division Finals after finishing third in the regular season. Williamson had 3 assists and 8 penalty minutes in 10 playoff games.
2010-11: Williamson appeared in one AJHL game with the Spruce Grove Saints and returned to the Oil Kings for his second season in midget AAA hockey. He had no points nor penalty minutes for the Saints. He scored 6 goals with 13 assists and had 70 penalty minutes in 32 games during the regular season with the Oil Kings. Leduc was third in the Dodge Division and reached the league championship series against Chrysler Division champion Red Deer. Williamson scored 3 goals with 1 assist in 15 playoff games and had 33 penalty minutes.
2011-12: Williamson played in 41 of 60 games for Spruce Grove in his first full AJHL season. He scored 9 goals with 9 assists and had 73 penalty minutes. Spruce Grove finished first in the North Division. The defending AJHL champions, the Saints lost to Fort McMurray in the playoff semifinals. Williamson scored 4 goals with 2 assist and had 14 penalty minutes in 11 playoff games.
2012-13: Williamson played 23 games for Spruce Grove – missing a significant portion of the season due to an "upper body" injury. He scored 1 goal with 10 assists and had 35 penalty minutes. Spruce Grove finished first in the North Division and lost to the South Division champion Brooks Bandits in the playoff finals. Williamson scored 1 goal with 3 assists and had 21 penalty minutes in 15 playoff games. In January he committed to playing college hockey at Penn State in 2013-14. He was ranked 183rd amongst North American skaters in Central Scouting's final rankings and was selected by Vancouver in the sixth round (175th overall).
Williamson utilizes his large frame well, and does a good job closing the gap on his opponents. If he earns an NHL job, his strong slap shot might be the ticket that gets him in. He is a fairly good skater but could make better use of his teammates while breaking out of his own zone.
Williamson will make the jump from the AJHL to Penn State University this fall. Now recovered from a leg injury that kept him out of action for a couple of months, he will start adapting to the nuances of college hockey. With good skating skills and a strong slap shot, his new coach Gus Gadowsky will have a couple of tools with which to work.