Diedrich joined Johnson, Spellman & Associates, Inc. in 2010 and has been a key member of the team for more than 10 years.

His responsibilities primarily include plumbing & fuel systems design and project management for projects such as universities, government facilities, office buildings, schools, laboratories, and commercial facilities.

Diedrich holds a BSME from Gwinnett Technical College.

In 2026, Diedrich obtained CPD accreditation from the American Society of Plumbing Engineers (ASPE), which recognizes advanced knowledge and expertise in plumbing system design.