Caleb is a mechanical engineer by training with a vibrant passion for sustainability. After working at FSB for four years and gaining licensure, he packed up with his wife and son and moved to the UK to pursue a Master’s in Engineering for Sustainable Development at the University of Cambridge. While at Cambridge, Caleb focused on sustainable building design and creating economic, environmental, and socially balanced solutions to eve-ryday problems. Upon degree completion, Caleb returned to FSB, continuing his engineering work while heading up our sus-tainability efforts at the firm. His role in Oklahoma City and the sustainable construction industry has grown significantly in the last two years. Specifically in 2023, Caleb has led several workshops and seminars on sustainability and decarbonization through the regional ULI and ASHRAE chapters. He has developed several effective tools to improve FSB’s firm-wide efficiency in sustainable design, and he has been pushing the envelope for what sustainable build-ing design can and should mean right here in Oklahoma City. He also serves as chair for governmental affairs for the Central Oklahoma chapter of ASHRAE, and advocates for improved standards and energy efficiency so-lutions locally and nationally. Caleb has also worked with our clients nationally in 2023, in particular, leading the efforts to earn LEED certifica-tion for every building on Airbus's U.S. Manufacturing Facility in Mobile, AL. Through all his sustainable design work in 2023, Caleb has worked on green building certification for over 1.8 million square feet of buildings with over $1.2 billion in construction budgets. Caleb is working to redefine what sustainability can mean for Oklahoma - not just a political topic or agenda but focusing on real-world solutions for social, economic, and environmental challenges. Caleb is also a board member for Neighborhood Services Organization and is passionate about their mission to provide safe, healthy homes as a way to transform lives and communities. In everything Caleb does, he hopes to create long-term success for Oklahoma City.

Sixteen years’ experience in sustainability market across non-profit, utility, and private organizations. Leads Decarbonization and Net Zero thought leadership at ULI, specifically focusing on Net Zero Mission Priority “journey to zero” and convenings/campaigns around the real estate value chain for tenants, utilities, and embodied carbon. Kara has managed utility energy efficiency contracts and new construction, existing building, and campus green building projects as well as commercial real estate ESG program strategy and implementation. Kara is also an adjunct professor at American University in the Environmental Studies program where she teaches courses in energy, pollution, and the environment.

Sam Day is a partner at the architecture and real estate development firm Dryline, which has championed such projects as the Big Friendly Brewery and the single-family detached homes in Wheeler.

Austin Tunnell is the Founder, CEO, and Head of Product at Building Culture, a holistic real estate development company dedicated to creating beautiful, resilient, and thriving places. With a hands-on approach, Austin oversees all aspects of design and craftsmanship, ensuring every detail aligns with the company’s vision for timeless and human-centered spaces. Austin’s journey into building began with a brief stint as a CPA at KPMG followed by two years in the Peace Corps. During his time abroad, he recognized that the built environment—our architecture—profoundly shapes the human experience, influencing not only how we live but also our physical health, mental well-being, and social connections. He saw how our current habitat fosters isolation, depression, financial instability, physical ailments from sedentary lifestyles, and even the erosion of culture and community. Compelled to make a difference, he apprenticed with a master mason and timber framer, gaining deep expertise in traditional building methods as a foundation for crafting healthier, more resilient, and culturally vibrant environments. As Head of Product, Austin leads all design and innovation at Building Culture. From masonry and massing to interior design, he sets the tone and feel of every project, ensuring a cohesive vision. He is also a relentless innovator, pushing the boundaries of masonry and construction techniques to create sustainable, enduring buildings. Austin’s work extends beyond design—he serves as a General Partner for various development deals, leading projects that embody Building Culture’s mission to craft neighborhoods that prioritize beauty, functionality, and long-term stewardship. He also hosts The Building Culture Podcast, where he engages with industry leaders and change-makers to explore holistic solutions for the built environment. Austin’s passion for craftsmanship and innovation has earned him national recognition, including two awards for his work in Carlton Landing. Now based in Oklahoma City, he continues to build a team of talented, passionate individuals, expanding Building Culture’s scope to encompass not just architecture and construction but also education, R&D, and the promotion of traditional building materials and methods. With a vision for multi-century architecture and a commitment to cultural impact, Austin is leading Building Culture to redefine how we shape the world around us.

Experienced Quality Manager with a demonstrated history of working in the building materials industry. Skilled in Quality Control, Cement, Concrete Testing, and Concrete Mix Proportioning. Civil Engineer with a Master's Degree focused in High Performance Concrete from Université de Sherbrooke.