A leader and innovator in this highly specialized field of geotechnical engineering, Henley-Johnston & Associates, Inc. (HJA), is a privately owned Texas Corporation based out of Dallas, Texas. Over 70 years ago, HJA was established to provide consulting geotechnical engineering and construction materials testing services. Since its inception in 1951, the firm has provided engineering consulting and testing services in the professional fields of geotechnical engineering; engineering geology; geomechanics (soil and rock); foundation engineering; and construction materials engineering, inspection, and testing. Henley-Johnston & Associates, Inc. (HJA) brings forth an unparalleled record of experience and achievement in working with major geologic formations underlying the greater northern Texas and southern Oklahoma subsurface region. Over the years we have expanded to add a second office in Austin, Texas to better serve the greater central Texas area.