About Gateway Science & Engineering

Gateway Science & Engineering

Gateway Science & Engineering (GSE) is a premier construction management and engineering firm dedicated to delivering innovative, high-quality solutions across a diverse range of industries. Established in 1993, GSE has built a strong reputation for excellence by providing comprehensive project and construction management, specialized inspection services, quality assurance, sustainability consulting, and information technology support. With over $55 billion in successfully managed projects, the firm is committed to exceeding client expectations by tailoring its services to the unique requirements of each project. GSE's expertise spans multiple project delivery methods, including Design-Bid-Build, Design-Build, and Construction Manager at Risk, ensuring flexibility, efficiency, and cost-effective solutions for public and private sector clients.

Headquartered in Pasadena, California, with additional offices in Inglewood, Long Beach, and San Francisco, GSE is strategically positioned to serve clients across the state. The firm’s leadership, spearheaded by President and CEO Art M. Gastelum, brings decades of experience in economic development, public service, and large-scale infrastructure projects. Under the guidance of seasoned professionals such as Christine G. Valenzuela and George Castillo, PE, GSE has grown into a trusted partner for municipalities, transportation agencies, educational institutions, and private developers. The company’s unwavering commitment to integrity, innovation, and client satisfaction drives its success, solidifying its role as a leading force in the construction and engineering industries.