2018 (Sr.): NSIC Defensive Player of the Year... NSIC North Division All-Conference First Team Defense and Special Teams... AFCA DII All-America First Team... D2CCA All-Super Region 4 Second Team Defense and Special Teams... D2Football.com Preseason All-America Team... NSIC North Division Preseason Defensive Player of the Year... Voted BSU's Defensive and Special Teams MVP... Totalled 63 tackles with 36 solo and 27 assisted... Had 1.5 tackles for loss and 3 interceptions... Totalled 4 pass breakups... Returned 3 kicks for 57 yards... Ran 16 punt returns for 269 yards... Totalled 424 all purpose yards for his senior season... Earned NSIC Special Teams Player of the Week (10/1/18). Following the season Olszewski particiapted in the University of Minnesota Pro Day and got invites to the Minnesota Vikings' and New England Patriots' Rookie Mini Camps... Signed to a free agent contract by New England May 22, 2019.

2017 (Jr.): NSIC North Division All-Conference First Team Defense... All-NSIC Second Team Special Teams... Don Hansen All-Super Region Three Second Team... NSIC Preseason North Division Defensive Player of the Year... Played in all 11 games for the Beavers while finishing second on the team with 67 tackles including three for a loss and one sack... Led the team with seven pass break-ups and also had one interception... Returned 16 punts for 168 yards (an average of 10.5 yards per return) as well as eight kickoffs for 188 yards (23.5 yards per return).

2016 (So.): All NSIC First-Team Defense, CCA All-Super Region Three Second Team Defense... 2016 Lindy's Sports Magazine Preseason All-Division II Second Team and Football Gameplan's 2016 Preseason All-American Team... Played in 11 games totaling 95 tackles (55 solo and 40 assisted)... Totaled 3 interceptions on the season and 10 broken up passes... Set a career highs in tackles with 17 vs Upper Iowa (Sept. 01), punt returns with 7 vs Minnesota Crookston (Nov. 12), punt return yards (194) vs Minnesota Crookston (Nov. 12) and punt return long (72 yards) vs Minnesota Crookston (Nov. 12)... Totaled 274 all-purpose yards and 277 punt return yards... Broke the Bemidji State University football single-game punt return yardage record by 40 yards and returned one punt for a touchdown vs  Minnesota Crookston (Nov. 12)... Played in the 2016 Mineral Water Bowl game where the Beavers beat Washburn 36-23, being the first team in program history to win a post-season game... Named NSIC Defensive Player of the Week (9/6/16) and NSIC Special Team Player of the Week (11/14/16). 

2015 (Fr.): 2015 NSIC North Division All-Conference First Team Defense... NSIC Newcomer of the Year... Played in all 11 games… Totaled 24 punt returns for 209 yards and ended the season with 264 all-purpose yards… On defense he recorded 85 total tackles, 56 of which were solo… Broke up five passes… Recorded one forced fumble and seven interceptions for a total of 55 yards and one touchdown… Recorded a career high three interceptions in a single game at Minot State (Oct. 31)… Was named NSIC Defensive Player of the Week (11/2/15) and D2Football.com Defensvie Player of the Week (11/4/15).

Prior to BSU: Was a two-sport athlete, earning two varsity letters in both football and baseball…Two-time First-Team all-district safety and holds the school record in tackles in a season (150) as well as career tackles (270) and career interceptions (7)…As a senior Olszewski forced six fumbles and returned three punts for touchdowns.

Personal: Born Nov. 26, 1996…Son of Eric and Collette Olszewski…In high school, he was on the academic honor roll…Undecided on an academic major at BSU…Father, Eric, was a minor league baseball pitcher for the Atlanta Braves organization.

Career Highs: Total Tackles: 17(x2) last vs Northern State (8/30/18); Solo Tackles: 10 at Minnesota Duluth (9/22/18); Assisted: 11 vs Northern State (8/30/18); TFL: 2.0 (2x) last at Minot State (10/31/15); Sacks: 1 vs St. Cloud State (11/4/17); Forced Fumbles: 1 (x2) last vs St. Cloud State (11/4/17); Fumble Recovery: 1 vs Upper Iowa (9/1/16); PBU: 3 (x4) last at Wayne State (9/29/18); Interceptions: 3 at Minot State (10/31/15); Defensive Touchdowns: 1 vs U-Mary (10/3/15); Punt Returns: 7 vs Minnesota Crookston(11/12/16); Punt Return Yards: 194 vs Minnesota Crookston (11/12/16); Punt Return Long: 72 vs Minnesota Crookston (11/12/16); Kick Return: 2 (x2) last vs St. Cloud State (11/4/17); Kick Return Yards: 64 at Wayne State (9/29/18); Kick Return Long: 64 at Wayne State (9/29/18); Rushing Attempts: 1 at MSU Moorhead (11/11/17); Rushing Yards: -1 at MSU Moorhead (11/11/17).