As a fifth-year senior in 1981–82, Herbert started at forward and Idaho won its first sixteen games, went 24–2 in the regular season,[9] and were sixth in the AP and UPI polls.[10][11] They advanced to the Sweet Sixteen,[12][13][14] and finished with the best record in school history at 27–3. While undefeated at 15–0, an article on the team appeared in Sports Illustrated.[15] Twice during the regular season, Herbert was the Big Sky player of the week,[16][17] and was second team all-conference.[18]
After college, he moved to Hyvinkää, Finland, in 1982, and joined Hyvinkään Tahko. He also represented Turun NMKY, Forssan Koripojat]], Helsingin NMKY and Korihait. In total, Herbert played professionally in Finland for 12 years with various teams. His club playing career ended in 1994, when he started coaching.
After ending his professional playing career in Finland, Herbert stayed in the country and started his coaching career in 1994 with Finnish Korisliiga team Korihait in Uusikaupunki, before moving to Espoon Honka in 1996.[19]
Herbert has coached many teams, including Frankfurt Skyliners, with which he won the German League title in 2004. He led the Skyliners to their 3rd German League finals appearance, against the league's first place Brose Bamberg, after beating other top-rated German teams, such as Alba Berlin, in the playoffs. He also coached French teams Paris and Pau Orthez, with which he won the French Cup in the 2006–07 season.
Herbert's contract with the Skyliners ended in May 2020.[22] On July 2, 2020, he signed with Avtodor of the VTB United League.[23] He was sacked in March 2021.[24]
In September 2021, he was named head coach of the Germany national team.[25] He guided the German team to a bronze medal at the 2022 European Championships[26] and to the gold medal in the 2023 World Cup.[27] On 17 December 2023, Herbert was named the Coach of the Year in Germany.[28] On 11 January 2024, Herbert was named the Coach of the Year also in Finland, by the Finnish sports journalists.[29][30] On 16 May 2024, it was reported that Herbert will leave the Germany national team after the 2024 Summer Olympics in Paris.[31]
Born in Canada, Herbert acquired Finnish citizenship via naturalization in the late 1980s. He is a fluent Finnish speaker. His son Daniel Herbert is also a basketball coach[33] In September 2023, Herbert said in an interview that he wishes, someday in the future, to end his coaching career in Finnish Korisliiga.[34]
Herbert owns a house in Uusikaupunki and a summer house in Pyhämaa, and visits there frequently.[35]