STAFF

At Jacobi, Toombs & Lanz, Inc. (JTL), we are proud to have a highly qualified staff of professional engineers, land surveyors, GIS specialists, and support personnel. Your project is of the utmost importance to us. Our principals and associates work one-on-one with each client to ensure your needs and expectations are exceeded by our product.

Corporate Office - Clarksville, IN


Jorge I. Lanz, P.E. President
Employed at JTL since 1977
Graduate of University of Louisville, B.S and M.Eng. in Civil Engineering 

B. Todd Booker, Associate - GIS\IT Manager
Employed at JTL since 1990
Graduate of Louisville Institute of Technology

Gregory E. Houck, P.E., P.L.S., Associate - Engineer V
Employed at JTL since 1985
Graduate of the University of Kentucky, B.S. in Civil Engineering

Thomas L. Schellenberg, P.E. Project Manager II / Transportation Manager
Employed at JTL since 1996
Graduate of University of Alabama, B.S. in Civil Engineering Technology

Stephen L. Marshall, P.E., P.L.S. Survey Manager
Employed at JTL since 2005
Graduate of Purdue University, B.S. in Civil Engineering and Land Surveying; Graduate of Indiana University, MBA

Horacio Urieta, P.E. Engineer III
Employed at JTL since 1998
Graduate of University of Louisville, B.S. and M.Eng. in Civil Engineering

Aaron R. Sutherland, P.E. Engineer II
Employed at JTL since 2000
Graduate of University of Kentucky, B.S. in Civil Engineering

James G. Silliman, P.E. Engineer II
Employed at JTL since 2002
Graduate of University of Louisville, B.S. and M.Eng. in Civil Engineering

Joshua N. Hillman, P.E., LEED Green Associate Project Manager I
Employed at JTL since 2005
Graduate of University of Louisville, B.S. and M.Eng. in Civil Engineering

Raymond A. Grangier, P.L.S. Land Surveyor
Employed at JTL since 2008
Attended Purdue University at Indiana University Southeast


Branch Office Louisville, Kentucky


Michael C. Harris, P.E., Vice President - Project Manager III / Louisville Office Manager
Employed at JTL since 1994
Graduate of University of Louisville, B.S. in Civil Engineering

Paul N. Luther, P.E. Project Manager II
Employed at JTL since 2007
Graduate of Purdue University, B.S. in Civil Engineering, University of New Mexico, MBA

Jacob L. Mathis, P.E. Engineer I
Employed at JTL since 2009
Graduate of Purdue University, B.S. in Civil Engineering

Lisa Acree Hardley, E.I.T. Engineering Tech IV
Employed at JTL since 2009
Graduate of University of Louisville, B.S. in Civil Engineering

Tony Kelly, E.I.T. Engineering Tech III
Employed at JTL since 2008
Graduate of Western Kentucky University, B.S. in Science and Engineering


Branch Office Indianapolis, Indiana


Patrick Holdsworth Indianapolis Office Manager
Employed at JTL since 2008
Graduate of University of Cincinnati

Chet Skwarcan, P.E. Project Manager II
Employed at JTL since 2011
Graduate of Purdue University, B.S. in Civil of Engineering

Ali Malek, P.E. Engineer IV
Employed at JTL since 2009
Graduate of University of Louisville, B.S. and M.Eng in Civil Engineering

Aaron M. Reynolds, P.E. Engineer IV
Employed at JTL since 2009
Graduate of Rose Hulman Institute of Technology, B.S. in Civil Engineering

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

  • National Society of Professional Engineers
  • Kentucky Society of Professional Engineers
  • Indiana Water Association
  • American Society of Civil Engineers
  • Institute of Transportation Engineers
  • Indiana Society of Professional Land Surveyors
  • Kentucky Association of Professional Land Surveyors

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