The Green Building Initiative (GBI) announced its 2026 Board of Directors, including newly elected officers and directors approved by GBI membership. The Board will guide the organization’s strategic direction as it continues its mission to improve the built environment’s impact on climate and society.

Sumayyah Theron, CEO and Founder of Avant‑garde Sustainable Solutions, will serve as Chair of the GBI Board of Directors for 2026. New and returning officers, along with directors serving multi‑year terms, were also elected.

“It is an honor to serve as Chair of the Green Building Initiative during a pivotal moment for the built environment,” said Sumayyah Theron. “GBI plays a critical role in helping organizations translate ambition into action, and I look forward to working with the Board, staff, and broader community to accelerate measurable sustainability, health and wellness, and climate resilience outcomes globally.”

“Sumayyah brings a holistic, global perspective to her leadership within GBI and a deep commitment to volunteerism, performance, and accountability,” said Vicki Worden, CEO of GBI. “As Board Chair, we will benefit from her extensive knowledge of the global application of building performance standards, which is instrumental as GBI continues to expand its impact across sectors and international markets.”

Theron’s industry expertise includes years of volunteering and leadership through ASHRAE, Board-level service with the Illinois Green Alliance, and two years chairing GBI’s ANSI/GBI 01 standard - Green Globes for New Construction Energy Subcommittee. Additionally, she is the founder of Avant‑garde Sustainable Solutions and has advised global organizations on sustainability integration, climate strategy, and operational resilience. She was named to Engineered Systems’ “20 to Watch: Women in HVAC” in 2024 and Crain’s Chicago Business Notable Leader in Sustainability both in 2024 and 2025. In 2023, she was awarded the GBI Advocacy Ambassador award.

Theron succeeds Alison Hoagland, Principal at Mackenzie, who served as Chair of the Board in 2025 and oversaw the creation of GBI’s Ascent Building Certification™ for international markets and its tremendous growth leading to its impending celebration in 2026 of certifying one billion square feet of commercial space. Hoagland continues her leadership role on GBI’s Board as Immediate Past Chair.

GBI 2026 Elected Officers and Executive Committee Members

• Chair: Sumayyah Theron – CEO & Founder, Avant-garde Sustainable Solutions
• Chair Elect: Randy Mortensen – EVP, Global Sales & Marketing, Leviton
• Immediate Past Chair: Alison Hoagland – Principal, Mackenzie
• Treasurer: Luis Perez‑Soto – VP Treasurer, Lennar Financial Services
• Secretary: Dain Hansen – EVP, Government Affairs, IAPMO
• At-large Director: Cons Gattuso – VP of Engineering, Piedmont Office Realty Trust
• At-large Director: Simon Turner – Founder, Building Cognition

New Board Members Elected for Three-year Terms

• Marcus Hassen – SVP, Mission Critical Services, Truist
• Phill Lawson‑Shanks – Chief Innovation Officer, Aligned Data Centers
• Karen Petersburg – SVP, Design & Engineering, American Real Estate Partners

Returning Directors

• Vincent Bataoel – Publisher and Senior Partner, BuildingGreen and Above Green
• Charline Cormier – Director of Sustainability, EastPoint
• Keely Felton – Chief Sustainability Officer, Nova Group, GBC
• Meagan Sykes – Energy Manager, Sobeys
• Laura Unrein – Sustainability Project Manager, Group14 Engineering
• Julie Wojnowski – Principal, ESG & Sustainability, Citadel EHS
• Tim Thiel (Emeritus Director) – Global Circular Economy Manager, Covestro