Owner & President

A graduate of the University of Southern California with a background in Mechanical Engineering, Mario brings both technical acumen and purpose-driven leadership to 5 Stone. After completing a postgraduate vocational Bible school program, he entered the construction industry with a clear calling—to build a company defined not only by technical excellence, but by integrity, trust, and long-term impact.

As President of 5 Stone, Mario provides strategic direction for the organization while fostering a culture rooted in accountability, craftsmanship, and people development. He leads with clarity and conviction, setting high standards and empowering teams to execute with confidence. His leadership is grounded in the belief that strong systems, aligned values, and engaged people are the foundation of a healthy and successful company.

Mario is known for his ability to balance vision with execution—seeing where the company is going while remaining deeply connected to how the work gets done. He is passionate about building an organization where employees can grow professionally and personally, and where every project contributes positively to the communities 5 Stone serves. Under his leadership, 5 Stone continues to scale with purpose, strengthen its reputation, and pursue excellence in everything it builds.

Director of Operations

A graduate of California State University, Long Beach, with a degree in Mechanical Engineering, Joshua brings both technical expertise and disciplined leadership to 5 Stone. As Operations Manager of 5 Stone, he oversees the day-to-day execution of the company, ensuring that systems, people, and projects move forward with clarity and purpose.

Known for his steady leadership and problem-solving mindset, Joshua plays a critical role in aligning field operations with company vision. He approaches every challenge with precision, accountability, and a commitment to excellence—driving consistency across teams while never losing sight of the people behind the work.

Joshua is deeply respected for his ability to see the big picture while remaining grounded in the details that matter. His leadership is marked by integrity, clear communication, and a relentless focus on continuous improvement. Under his operational guidance, 5 Stone continues to scale responsibly, execute with confidence, and uphold the standards that define its culture.

Director of Field Operations

With more than 20 years of experience in the mechanical trades, Tim brings a depth of field knowledge and operational leadership that anchors execution at 5 Stone. His career has been built from the ground up, giving him a comprehensive understanding of what it takes to deliver complex mechanical projects with precision, safety, and consistency.

As Director of Field Operations, Tim oversees field execution across all projects, ensuring teams are aligned, standards are upheld, and resources are deployed effectively. He is instrumental in setting the pace, expectations, and accountability for jobsite performance—bridging strategic direction with real-world execution.

Tim’s impact extends beyond operations. He is widely respected for his character, leading with integrity, humility, and steadiness. He holds teams to high standards while remaining deeply invested in their growth and success. Known for his clear communication and decisive leadership, Tim fosters trust across crews, foremen, superintendents, and project teams. Through his leadership, 5 Stone’s field culture remains disciplined, professional, and committed to excellence.