Why Tinnacity

Meet the team.

We default to generosity — when it would be easy to go low, we go high. That’s how we treat our customers, our partners, and each other.

Meet the Owners

The people behind the platform.

Dave Tinnerman
Dave Tinnerman
Founder / CEO

Ohio-raised software expert and Wright State University grad who founded Tinnacity in 2014 to transform service operations for independent dealers. A former volunteer firefighter and state-champion coach, he leads with a "family first" approach built on honesty and transparency.

Brett Robison
Brett Robison
CTO

Ohio State computer science grad who has spent his career in material handling and service software. He runs on a "learn, iterate, evolve" methodology for rapid innovation. Based in Jacksonville, Florida; an avid traveler and distillery enthusiast.

The Team

The crew building and supporting it.

Aaron Harshbarger
Aaron Harshbarger
Principal Software Engineer

20+ years across manufacturing, healthcare, and utilities. A Bowling Green State University alum with deep Crown Equipment experience in material handling. A Midwest Ohio-based father of five with two grandchildren.

Brad Cotterman
Brad Cotterman
Director of Operations

Holds a master’s in Data Analytics and previously led product development at Crown Equipment and engineered software at Hartzell Industries. A Sidney, Ohio-based youth sports coach committed to mentorship and operational excellence.

Brady Fleming
Brady Fleming
Sales Executive

Bowling Green State University grad in sales and service marketing with a software/technology sales background (2025). A Columbus-based high school basketball official who brings integrity to every partnership. Golfer and sports enthusiast.

Brian Robison
Brian Robison
Sales Engineer

A Bowling Green State University alum who joined Tinnacity after a tenure as Senior Territory Account Manager at IGS Energy. Based in Arcanum, Ohio, he’s also Head Soccer Coach at Franklin Monroe High School. He’s focused on building lasting relationships and an elite customer experience. Off the clock, he’s with his wife Karina and their three sons.

Christian Smith
Christian Smith
Customer Success Manager

Northwest Ohio native who spent a decade in the railroad industry across seven states as a Field Manager and Superintendent. He brings that operational expertise to helping users master Tinnacity. A Buckeyes fan who enjoys kayaking and dad jokes.

Cory Frey
Cory Frey
Senior Software Engineer

Tiffin University grad who started at Tinnacity in customer support five years ago and taught himself to code, moving into engineering over three years. Marysville, Ohio-based; enjoys golf, cigars, and whiskey.

Grant Humphrey
Grant Humphrey
Junior Software Engineer

Ohio University CS grad (2025) focused on technical efficiencies across the global supply chain. A Covington, Ohio-based fitness enthusiast passionate about automation and cost savings. Plays basketball and golf and loves world travel.

Jack Hewis
Jack Hewis
Junior Customer Success Manager

Kent State grad (2023) with four years in retail service and engagement. Recently relocated from Northeast Ohio to Pittsburgh. Focused on strengthening partner relationships and seamless onboarding.

Joe Hewis
Joe Hewis
Director of Sales

20+ years selling technology to equipment dealers. Once ERP-focused, he now zeroes in on service-operations profitability and workflow. A Kent State alum and Cleveland native who splits time between Lake Erie and Southwest Florida. Dog-rescue advocate and adventure motorcyclist.

Julie Cotterman
Julie Cotterman
HR / Office Manager

Bowling Green State University business grad with eight years of HR in manufacturing and four in real estate office management. Based in Sidney, Ohio, she manages the office alongside her husband Brad. A sports mom and euchre enthusiast.

Katie Duvall
Katie Duvall
Head of Brand Strategy & Growth

Specializes in authentic connection and purpose-driven storytelling, with a background spanning hospitality, manufacturing, and SaaS. She brings high energy and positivity to company culture. A dedicated mother who enjoys travel and food.

Mark Harshbarger
Mark Harshbarger
Junior Software Engineer

Wright State University computer science grad and dedicated problem-solver. Off the clock he’s outdoors — pickleball, fishing, walks, and movies. Recently joined the Sidney, Ohio team.

Michael Simon
Michael Simon
Sales Executive

A former educator and Ohio Dominican University basketball player who joined in 2020. He’s driven by client success — and the moment a solution finally clicks for a customer. Lives in Hilliard, Ohio with his wife and Golden Retriever.

Tina Gelhaus
Tina Gelhaus
Senior Customer Success Manager

22 years at Crown Equipment and a lifelong technology lover. She’s an expert at turning first-time users into loyal customers through training. St. Henry, Ohio-based — and has been "hacking" technology since the eighth grade.