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Daniel Gillean is the founder and majority owner of Gillean Brothers Roofing. With a strong entrepreneurial mindset and commitment to doing business the right way, Daniel built GBR on integrity, accountability, and long-term customer relationships.
He focuses on company vision and strategic growth while ensuring the standards that built GBR’s reputation remain strong throughout Denton County and surrounding communities.
When he’s not working, Daniel enjoys spending time with his son, hiking, mountain biking, and kayaking.
Donna Barnhill serves as General Manager and Co-Owner of Gillean Brothers Roofing, overseeing daily operations from estimate to final invoice. She manages scheduling, materials procurement, financial oversight, and customer communication — making her the operational backbone of the company.
Donna is known for her attention to detail, process-driven leadership, and commitment to clear, transparent communication with every customer.
When she’s not working, Donna enjoys spending time with her son, giving back to the community, hiking, and working out.
Joe Currin leads the sales team at Gillean Brothers Roofing and is known for his relationship-driven approach and deep knowledge of roofing systems and insurance claims. He works closely with homeowners to provide clear assessments and guide them confidently through the roofing process.
When he’s not working, Joe enjoys spending time with his wife and three daughters, participating in veteran activities, staying active in fitness, tackling home improvement projects, and staring proudly at his grass.
Trevor Callahan serves as a Sales Representative at Gillean Brothers Roofing, conducting roof inspections, documenting damage, and providing honest, straightforward recommendations. He’s known for his approachable style and commitment to making the roofing process simple and stress-free.
When he’s not working, Trevor enjoys spending time with his family and children, swimming, cycling, and reading.
Diego Vivanco oversees project execution in the field as Project Manager, ensuring every roof is installed to GBR’s high standards. He coordinates crews, manages timelines, oversees quality control, and ensures each job site is left clean and protected — including the use of GBR’s Catch-All property protection system.
With hands-on experience and a strong attention to detail, Diego ensures materials are installed correctly and that projects move efficiently from tear-off to final inspection. His role is critical in delivering the quality workmanship and organization that customers expect from Gillean Brothers Roofing.
When he’s not working, Diego enjoys spending time with family, personal finance, cake decorating, and playing pickleball.
Every person on this page has a direct role in your project – from the first inspection to the final walkthrough.
GBR wasn’t built by a faceless corporation. It was built by people who live in the same Denton County communities they serve, on a foundation of integrity, clear communication, and work they’re proud to put their name on.
Denton County isn’t just where we work. It’s where we live.