Jacobi, Toombs and Lanz Engineering (JTL)

JTL is an established Civil, Survey and Environmental Engineering firm that has provided Professional Engineering Services since 1955.

Every project awarded to our firm receives special attention and is developed with technical excellence and client satisfaction in mind. JTL makes every attempt to approach our services with a detailed recognition of the unique requirements often demanded by various projects. We perform our daily processes with a systematic approach in an environment that encourages teamwork and communication.

For over 65 years Jacobi, Toombs & Lanz has offered professional engineering services to a wide variety of clients through many different sectors. We pride ourselves on being a mid-sized consulting, engineering and surveying firm focused on Integrity, Community and Trust.

Salem, IN

Our commitment to becoming the best remains today
just as it did over 66 years ago.

Staying Current

To ensure that our practice stays current with advancing trends in the fields of engineering and land surveying, our staff, affiliates with the following state and national organizations:

  • National Society of Professional Engineers
  • Kentucky Society of Professional Engineers
  • Water Environment Federation
  • Indiana Water Environment Association
  • Indiana Rural Water Association
  • Clean Water Professionals of Kentucky and Tennessee
  • American Society of Civil Engineers
  • Institute of Transportation Engineers
  • Indiana Society of Professional Land Surveyors
  • Kentucky Association of Professional Land Surveyors
  • International Code Council, Inc. (ICC)
  • National Fire Protection Association (NFPA)
  • Indiana Association of Building Officials (IABO)
  • Code Administrators Association of Kentucky (CAAK)
  • Fire Inspector Association of Indiana (FIAI)
  • American Council of Engineering Companies (ACEC)
  • Society for Marketing Professional Services (SMPS)
Landscape Architect
Years Firm Experience


Michael C. Harris, P.E., serves as President and has worked in the engineering profession for twenty-three years. He graduated in 1996 with a Bachelor of Science in Civil Engineering from the University of Louisville. Michael has a wide range of experience including CSO Separations, solids and floatables controls, sanitary and storm sewer planning and design, solid waste permitting, design and construction, aviation facility planning and design, and roadway planning, design and construction as well as land surveying.

Stephen L. Marshall, P.E., P.L.S, Vice President, graduated in 1995 with a Bachelor of Science degree in Civil Engineering and Land Surveying Engineering from Purdue University. He also received a Masters of Business Administration from Indiana University Southeast. Prior to joining JTL, Mr. Marshall was employed with Blankenbaker & Son Land Surveyors in Jeffersonville, IN (1993-1997); Mindel, Scott & Associates in Louisville, KY (1997-2002); and, John G. Brinkworth Consulting Engineers in New Albany, IN (2002-2005). During his tenure with these firms, he served as a field crew chief, staff surveyor, project design engineer, and surveying department manager.

As Director of Surveying for JTL Steve is responsible for supervising the successful completion of all surveying task associated with various company projects. He works both in Indiana and Kentucky.

Joshua N. Hillman, P.E., P.L.S., Vice President, LEED Green Associate, graduated in 2004 with a Bachelor of Science degree in Civil Engineering and in 2005 with a Masters of Engineering both from the University of Louisville. Mr. Hillman has 12 years of utility and transportation infrastructure engineering experience, and has worked on a wide range of projects including: design, construction management, inspection, planning, and permitting.

Aaron R. Sutherland, P.E., Associate, graduated in 1999 with a Bachelor of Science degree in Civil Engineering the University of Kentucky. Mr. Sutherland has 18 years of experience in a variety of utility and infrastructure improvement projects. His responsibilities include design, utility coordination, construction management, computer modeling, and permitting.

Joshua G. Darby, P.E., Associate, graduated in 2010 with a Bachelor of Science in Civil Engineering from the University of Louisville.  Mr. Darby has 9 years of engineering experience and has worked on a wide range of projects including planning, design, permitting and construction management of sanitary and stormwater management systems, roadways, site development, potable water systems, and other various utilities and infrastructure.

Nathan W. Frey, P.E., Graduated from Purdue University in 1999 with a Bachelor of Science degree in Civil Engineering.  Mr. Frey has a very diverse education and background and has worked for or with State, Federal and Local Agencies his entire career.   He has extensive knowledge and experience in both the private and public sectors of civil engineering.  Mr. Frey adapts to change well and thrives in a busy environment.  Since joining Jacobi, Toombs and Lanz, Inc., Mr. Frey has been instrumental in several projects related to transportation engineering and bridge design. He is licensed in Indiana and Kentucky.