Mottau joined the Steel as Assistant Coach prior to the start of the 2025-2026 season. He served alongside Scott Gomez in the 2024-2025 season with the Surrey Eagles (BCHL) as an assistant coach and was a scout for the Chicago Blackhawks from 2014 to 2020. The Blackhawks won their third Stanley Cup in six years in Mottau's first year with the team in 2014.
Mottau played four seasons at Boston College as a defenseman and captained the team in 1999. That same season, he was the recipient of the Hobey Baker Award following a 43-point year. He was named to an NCAA All-American Team in his final three seasons at BC. Over his four seasons as an Eagle, Mottau skated in 163 games and scored 157 points with 27 goals and 130 assists. He owns Boston College's all-time assists record.
The New York Rangers selected Mottau in the 7th round of the 1997 NHL Draft, and he made his NHL debut following the conclusion of his collegiate career in 2000. He played most of his rookie season in 2000-2001 with the AHL's Hartford Wolf Pack and tallied 43 points in 61 games. He was named to the AHL All-Star Game and AHL All-Rookie Team that season.
Mottau played for the Boston Bruins, Calgary Flames, Florida Panthers, New York Islanders, and New York Rangers, appearing in 321 games. He played 526 AHL games, was named to three AHL All Star Games, and scored 303 points with 48 goals and 255 assists.
