Westphal was drafted by the Boston Celtics in 1972 and played for the team for two seasons. He then moved to the Phoenix Suns, where he played for five seasons and was named to the All-Star team four times. He was also part of the Suns team that made it to the 1976 NBA Finals.
In 1981, Westphal was traded to the Seattle SuperSonics, where he played for three seasons. He was named to the All-Star team once and was part of the team that made it to the 1979 NBA Finals.
Westphal then moved to the New York Knicks, where he played for two seasons. He was named to the All-Star team once and was part of the team that made it to the 1984 NBA Finals.
Westphal then moved to the Sacramento Kings, where he played for two seasons. He was named to the All-Star team once and was part of the team that made it to the 1986 Western Conference Finals.
Westphal then moved to the San Antonio Spurs, where he played for one season. He was named to the All-Star team once and was part of the team that made it to the 1989 Western Conference Finals.
Westphal then moved to the Phoenix Suns, where he played for one season. He was named to the All-Star team once and was part of the team that made it to the 1993 NBA Finals.
Westphal then moved to the Miami Heat, where he played for one season. He was named to the All-Star team once and was part of the team that made it to the 1997 Eastern Conference Finals.
Westphal then moved to the Los Angeles Clippers, where he played for one season. He was named to the All-Star team once and was part of the team that made it to the 2000 Western Conference Finals.
Westphal then moved to the Phoenix Suns, where he served as an assistant coach for two seasons. He then moved to the Seattle SuperSonics, where he served as an assistant coach for one season. He then moved to the Sacramento Kings, where he served as an assistant coach for two seasons. He
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