TGA is a complete multi-disciplined corporation with licensed professional engineers & surveyors registered in the states of Ohio, Kentucky, Indiana and Michigan.

Located in Cincinnati, Ohio, Thomas Graham Associates, Inc. (TGA) is a firm comprised of accomplished professionals providing civil engineering and land surveying services in the tri-state area.  TGA started as a sole proprietorship in 1951 by founders Thomas L. Graham and his son, Thomas R. Graham.  In 1993, Robert W. Trenkamp took over as owner and president.  Today, the firm continues to be a family-owned business that has expanded into an association that serves the community and construction industry. 


The TGA team is comprised of licensed professional engineers and surveyors registered in the States of Ohio, Kentucky, Indiana, and Michigan.  Since 1951, TGA has built a strong reputation for its reliable and timely performance while creating excellent working relationships.  The TGA team is committed to providing customer service with honesty, integrity, and dedication.