The people behind Tinnacity.

Dave Tinnerman
Background

Ohio-raised with deep farming roots, Wright State University computer science graduate, software expert, and service aficionado.

Field Grit

Founded Tinnacity in 2014 to transform service operations for independent dealers; leads with a "family first" approach built on honesty and transparency.

Off the Clock

Golf enthusiast, former volunteer firefighter, and state-champion coach.

Dave Tinnerman
Founder / CEO, Tinnacity
Brett Robison
Background

Ohio native and OSU grad whose father was a field service technician. After engineering software at Crown Equipment, he joined Tinnacity in 2021 to help dealers scale, founded its engineering organization, and now leads the team from Jacksonville, building with AI, not around it.

Field Grit

Translates real dealer workflows into intuitive software, bringing decisive judgment and steady momentum to the team. Grounded in the belief that great tech comes from seeing the work up close and finding tools that make the team faster.

Off the Clock

Husband and father of two who loves traveling the world, hiking, and coaching his sons in soccer.

Brett Robison
Partner / CTO
Brad Cotterman
Background

Former software engineer and new product development leader for connected products at Crown Equipment. Holds a Master’s in Data Analytics and specializes in turning emerging tech into practical customer solutions.

Field Grit

Translates complex technical data into clear, repeatable systems. Driven by a hands-on curiosity and the belief that great processes empower field teams to reach their full potential.

Off the Clock

Lives in Sidney, Ohio, with his wife, three kids, and dog. Spends his free time coaching youth soccer, basketball, baseball, and fastpitch.

Brad Cotterman
Director of Operations
Joe Hewis
Background

Kent State alum and Cleveland native who splits time between Bonita Springs, FL and Cleveland, OH.

Field Grit

Brings 20+ years of tech sales experience in the equipment dealer space. Formerly ERP-focused, he now leads the Tinnacity sales team with a sharp focus on driving service operations profitability and workflow efficiency.

Off the Clock

An adventurous spirit who enjoys motorcycling, golfing, and boating with friends and family.

Joe Hewis
Director of Sales, Tinnacity
Michael Simon
Background

With Tinnacity since 2020, his path to sales spans early-childhood education and playing college basketball at Ohio Dominican University. College sports built his competitive drive, while teaching built his ability to listen, adapt, and earn trust with clients.

Field Grit

Focuses on active listening and deeply understanding a dealership's operational needs. Whether tackling complex deals or solving problems on the fly, he does the heavy lifting to deliver real results.

Off the Clock

Home base is Howard, Ohio, with his wife, one-year-old son, and Golden Retriever. In his downtime, he enjoys boating on the lake, playing 18 holes of golf, and tuning into NASCAR on weekends.

Michael Simon
Sr. Sales Executive
Tina Gelhaus
Background

A Senior Customer Experience Manager at Tinnacity with a 22-year career at Crown Equipment, where she built her deep expertise in customer success, onboarding, and training.

Field Grit

Turn first-time customers into lifelong brand advocates. She thrives on guiding clients through onboarding and delivering seamless training experiences that ensure long-term success.

Off the Clock

Lives in Coldwater, Ohio, and loves spending time with family and friends. A lifelong tech enthusiast, whose very first project was a DIY cassette-and-camcorder slideshow in 8th grade. She stays creative through Cricut crafting and making custom videos for special occasions.

Tina Gelhaus
Sr. Customer Experience Manager
Cory Frey
Background

Senior Software Engineer and Tinnacity's first employee, with the company since 2018. Has worn every hat in the business; sales, customer support, training, engineering, and now builds across every Tinnacity platform, coding from the customer's perspective, not the office's.

Field Grit

Moves across the whole stack without waiting for a handoff, if it touches a dealer's day, he's probably built part of it. Believes the shortest path to a good product is fewer people between the problem and the fix.

Off the Clock

Husband and father of three in Central Ohio who spends his free time watching football, fixing things around the house, and playing golf.

Cory Frey
Sr. Software Engineer
Christian Smith
Background

Northwest Ohio native (and big Buckeyes fan!).

Field Grit

A decade in the railroad industry as a Field Manager and Superintendent across seven states built his knack for creative problem-solving. Training and mentoring crews was his favorite part of the job, leading him to Tinnacity, where he now brings that same field-tested expertise to helping clients get the most out of the platform.

Off the Clock

Avid college football fan, kayaker, and history buff who enjoys touring state capitols and appreciating a clever dad joke.

"Knowledge is knowing a tomato is a fruit. Wisdom is knowing not to put it in a fruit salad."

Christian Smith
Sr. Customer Experience Manager
Brian Robison
Background

Graduated from Bowling Green State University and spent 3 years as a Senior Territory Account Manager at IGS Energy before joining Tinnacity 2 years ago. Now serves as a Sales Engineer, helping dealerships see how Tinnacity's software can improve service operations.

Field Grit

Specializes in building sales automations and market research that keep the team ahead; brings forward-thinking ideas and positive energy to the table. Rooted in a belief of continuous learning and improvement, driven by building relationships that outlast the sale.

Off the Clock

Lives in Brookville, Ohio with his wife Karina and their three sons, Knox, Maddox, and Theo. Enjoys time with family and friends, and coaching soccer.

Brian Robison
Sales Engineer
Grant Humphrey
Background

An Ohio University Computer Science graduate (2025).

Field Grit

His goal is simple: make day-to-day operations easier. He digs into the global supply chain to identify what’s slow, manual, or costly, then engineers technology that automates it away, turning small efficiencies into serious cost savings at scale.

Off the Clock

A Covington, Ohio native, he is always on the move. When he isn't lifting, you’ll find him hiking in nature, on the basketball court or golf course, or spending quality time with the family and friends who keep him grounded.

Grant Humphrey
Software Engineer
Julie Cotterman
Background

BS in Business Administration from BGSU. Eight years of manufacturing HR experience, four years in real estate management, and now HR Administrator / Office Manager at Tinnacity, overseeing HR, Accounting, and Operations.

Field Grit

Keeps HR, Accounting, and Operations running smoothly at once. Brings steady, organized energy, supporting the team through a balance of strong process and personal connection.

Off the Clock

Lives in Sidney, Ohio with her husband Brad and three kids. Spends most weekends on the sidelines cheering on her kids, and enjoys playing and watching volleyball, movies, euchre, and retail therapy.

Julie Cotterman
HR / Office Manager
Aaron Harshbarger
Background

Lifelong Ohioan and BGSU alum who spent eight years consulting in healthcare, telecom, and retail before joining Crown Equipment. Principal Software Engineer at Tinnacity, applying 20+ years of tech experience to dealer operations.

Field Grit

Specializes in troubleshooting complex problems and fixing them at the root; brings a calm, behind-the-scenes focus to the team. Focused on making software work so seamlessly users never think about it, driven by turning tough hurdles into simple wins.

Off the Clock

Lives in Ohio with his wife, five kids, a son-in-law, two grandkids, and their dog. Enjoys trapshooting, fixing things, DIY projects, and quality family time.

Aaron Harshbarger
Principal Software Engineer
Brady Fleming
Background

Graduated from Bowling Green State University with a B.S. in Business Administration, specializing in Sales and Service Marketing. Today, Brady is a Sales Executive excited to celebrate his 1-year mark with Tinnacity in October 2026.

Field Grit

Software/technology sales background since 2022; brings energy, integrity, and a focus on long-term partnership to every sales opportunity.

Off the Clock

Lives in Columbus, Ohio with one of his good friends. Enjoys officiating high school basketball, golfing, spending time with friends and family, and cheering on the Ohio State Buckeyes and Cincinnati Bengals.

Brady Fleming
Sales Executive
Katie Duvall
Background

Kentucky native who built a career at the intersection of people, products, and tech. Transitioned from high-touch hospitality into heavy industrial, distribution, and SaaS sales. Now leveraging storytelling and marketing to increase brand awareness for Tinnacity throughout the equipment industry.

Field Grit

Specializes in authentic connection and purpose-driven brand building; brings high energy and positivity to company culture. Rooted in the belief that human relationships matter most, driven by a passion for helping others succeed.

Off the Clock

Dedicated mother of two who loves traveling, yard work, binge-watching a great TV show, and exploring new local spots to eat.

Katie Duvall
Head of Brand Strategy & Growth
Jack Hewis
Background

Kent State University grad ('23) with 4 years in retail Service & Engagement, honing his communication, customer service, and team collaboration.

Field Grit

Joined Tinnacity in Dec 2025. Thrilled to leverage his background to keep the client experience seamless. From daily support to partner onboarding, he is dedicated to strengthening client relationships.

Off the Clock

Based in Pittsburgh, PA. In his free time, he enjoys hiking, golfing, working out, and spending time with family and friends.

Jack Hewis
Jr. Customer Experience Manager
Mark Harshbarger
Background

Graduated from Wright State University with a B.S. in Computer Science in May 2026. Mark is a Junior Software Engineer excited to build his career with the Tinnacity team.

Field Grit

Specializes in collaborative development and adapting to new technologies like AI; brings enthusiasm, adaptability, and fresh insights to the team. Rooted in the belief that continuous learning unlocks better solutions, driven by mastering new tools to build smarter systems.

Off the Clock

Lives in Sidney, Ohio. Likes staying active with pickleball, fishing, and long walks. Enjoys hanging out with friends and family.

Mark Harshbarger
Jr. Software Engineer
Our Support Promise

Elite support built by people who know heavy equipment.

Software is only as good as the team behind it. Watch how top dealership managers describe Tinnacity’s sub-30-minute response times, proactive communication, and relentless commitment to keeping field teams running.

Ready to see what sets Tinnacity apart?

Discover how our values drive our team and deliver real results for field service operations worldwide.

90% Paperwork Reduction|24-Hour Billing Cycle|Zero Lost Invoices