About US


Originally founded in 1936 by Frank H. Kneas, Long, Tann, & D'Onofrio, Inc. (LT&D) is among the oldest and most experienced full service structural engineering consulting firms in the mid-Atlantic region.

Today our experience enables us to provide a single source of service for our clients - from concept to occupancy. We have expertise in the design of institutional, educational, commercial, industrial and residential projects. With our broad experience and direct construction experience our staff is uniquely qualified to achieve optimum solutions for the most demanding design problems using a variety of materials. The establishment of positive working relationships, our extensive experience and the continuous training of our staff provides us with the ability and confidence to meet the needs of a wide range of clients at the highest level.

LT&D understands the importance of providing safe, economical structural designs in a timely manner. With our experience, in addition to knowledge of the latest design techniques, structural engineering modeling, materials technology and cost-effective planning, enables us to offer practical and economical solutions to most effectively meet our clients’ immediate and long-term goals. LT&D also values effective communication between the project team to ensure the successful completion of every project. Our long-term relationships and repetitive projects with our clients is evidence of our success.

As members of national and local engineering societies, such as the Structural Engineers Association International, the Structural Engineering Institute, the American Consulting Engineers Counsel, and the American Society of Civil Engineers, we are committed to remaining current on the latest codes and innovations in structural and architectural engineering. As members of the United States Green Building Council, LT&D is committed to a prosperous and sustainable future through cost-efficient and energy-saving green buildings

LT&D’s engineers are registered in multiple states throughout the United States. Our registration with the National Council of Examiners for Engineering and Surveying allows us to become registered in additional states in a timely manner as it becomes necessary.

Leadership Team