William R. Kraner, P.E., C.E.M

Marvin M. Arroyo, P.E.

Mechanical Engineer •

Marvin earned his degrees of Bachelor of Science and Master of Science in Mechanical Engineering from the University of Arkansas. He started as a Mechanical Designer at Benchmark Group in 2019. In 2020, he became a Mechanical Engineer in Training (EIT) and later a Professional Engineer (P.E.). His experience includes HVAC, Plumbing, and Refrigeration for Walmart and Sam’s Club remodel projects. He has also assisted in cooling tower replacement design projects for the Cap-X team. Marvin became the lead mechanical designer on the Walmart remodel team and has assisted in mentoring and training the newest members of the team. Additionally, Marvin’s bilingual skills have helped other teams communicate with contractors in Spanish-speaking jurisdictions.

Licensed In:

AR – 21517

CO – PE.0063862

CT – PEN.0037205

IN – PE123003

KY – 39419

MI – 6201312230

MN – 62154

NC – 055859

NJ – 24GE06041700

OH – PE.89058

OK – PE34012

SC – 42328

TX – 148446

TX Firm – F-24401

VA – 0402066365

WV – 26446


Master of Science, Mechanical Engineering

Bachelor of Science, Mechanical Engineering

University of Arkansas


American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE)

National Council of Examiners for Engineering & Surveying (NCEES)