After being drafted by the Red Wings in June 2019, the 6-foot-3, 209-pound blueliner quickly joined Detroit's AHL-affiliate Grand Rapids Griffins for Opening Night of the 2019-20 season.
Seider brought a laundry list of accomplishments with him to Grand Rapids, including winning the Deutsch Eishockey Liga's Rookie of the Year as a 17-year-old in 2018-19. He also led his Adler Mannheim club to the DEL championship that season, earning the second-highest scoring season ever for an under-18 defenseman in the DEL.
Seider held his own right away in the AHL, earning 22 points in 49 games in 2019-20, and he was poised to lead the Griffins into the Calder Cup Playoffs, but the AHL was forced to cancel the postseason in March 2020 due to the COVID-19 pandemic.
Because the pandemic delayed the start of the 2020-21 AHL campaign, Seider was loaned to Rogle BK of the Swedish Hockey League to continue his development overseas.
Seider earned 28 points on seven goals and 21 assists in 41 SHL games this season, playing an average of 20:14 per game.
After a scoreless debut, Seider earned points in five straight games and quickly made his presence felt in Sweden's most competitive league. The 20-year-old defenseman immediately earned trust from his coaches with his versatility, skill and physicality, being able to play well and impose his will in all aspects of the game.