Hellmuth, Obata & Kassabaum, Inc., commonly known as HOK, is a global design, architecture, engineering, and planning firm. Founded in 1955, the company has grown to become one of the largest architectural firms in the world, with offices across North America, Europe, the Middle East, and Asia Pacific. HOK is renowned for its innovative design solutions and commitment to creating spaces that enhance the human experience.

HOK places a strong emphasis on sustainability and environmental responsibility. The firm integrates sustainable design principles into all of its projects, aiming to minimize environmental impact and promote energy efficiency. HOK has been recognized for its leadership in sustainable design, with numerous projects achieving LEED certification and other sustainability accolades. The company is committed to reducing its carbon footprint and actively participates in initiatives to promote sustainable practices within the architecture and construction industries.

HOK's sustainability efforts are guided by a comprehensive approach that includes energy modeling, daylight analysis, and the use of sustainable materials. The firm is dedicated to advancing the field of sustainable design through research and collaboration with industry partners. HOK's commitment to sustainability is reflected in its participation in the AIA 2030 Commitment, which aims to achieve carbon-neutral buildings by the year 2030.