[2] Mengelt also participated in football (All-State as a Senior), baseball and track & field in high school.

[3] On February 14, 1970, he set an Auburn record with 60 points in a game against the University of Alabama He was named first team All-Southeastern Conference (SEC).

[3] In his senior season of 1970–71, Mengelt averaged a still-standing school-record 28.3 points per game as the Tigers went 11–15.

[7] On December 14, 1974, he set a career high with 33 points against the Philadelphia 76ers, and he scored 30 on March 9, 1975, against the Kings.

[12] On November 18, 1976, he was sold to the Chicago Bulls, for whom in 1976–77 he played 61 games, averaging 8.3 points, 1.8 rebounds and 1.9 assists.

[14] Mengelt was a fan favorite wherever he played, earning the nickname "Crash" from Royals teammate Norm Van Lier for his willingness to dive after loose balls.

He also continued to grow his own successful executive search firm, Breckenridge Partners, located in the Chicago suburb of Lake Forest, Illinois Breckenridge Partners has executed over 1,000 retained executive searches working in various industries including Healthcare, Higher Education, Financial Services, Technology, Manufacturing, Distribution and Consulting and Not for Profits.

Some of Breckenridge Partners clients have included IBM, Walt Disney World, One America Financial Partners, Applied Biosystems, CR Bard, Textron and Public Accounting Firm Ernst & Young and several Not for Profits, and Universities.

As an avocation, Mengelt also spent 20+ years in broadcasting basketball games for WGN, ESPN and ABC.

They have one grown daughter, Jennifer Mengelt Corridon, and twin grandchildren Cullen and Hannah, born in 2013.