Headquartered in San Francisco, California, TYLin established its business in the design of long-span bridges and specialty structures.

The firm provides a range of planning, design, construction and project management services to the aviation; bridge; facilities; mobility, planning, and management; ports and marine; rail and transit; and surface transportation industries.

TYLin operates from more than 50 regional centers across four continents, and employs a professional staff of more than 3,000 engineers, planners, architects and scientists.

[2][3] 1960s–1970s: Lin continued to expand his firm's specialty in prestressed concrete to broader consulting services, with projects that included conventionally reinforced concrete, structural steel, masonry, and timber-framed structures.

Lin International expanded with new offices in Kuala Lumpur and a merger with Maine-based Hunter-Bellow Associates in the U.S.

In 1986, when U.S. President Ronald Reagan presented Lin with the National Medal of Science, he responded by handing the former president a detailed plan for a 50-mile-long (80 km) “Intercontinental Peace Bridge” connecting Alaska and Siberia across the Bering Strait.