About Matrix PDM Engineering


Building on a rich history that spans many industries, four companies have come together to form Matrix PDM Engineering.

The original Tulsa-based engineering office has been a key contributor to the growth of Matrix Service Company, providing industry-leading expertise in aboveground storage tanks and steel plate structures.

The acquisition of PDM (Pittsburgh Des Moines) brought more than 50 years of history and multi-discipline engineering services specializing in terminals, cryogenic storage applications, spheres and other steel plate structures.

Another acquisition- EDC - brought over 40 years of experience of technical expertise in design and installation of material handling systems.

Most recently, Matrix PDM acquired Houston Interests in December of 2016, expanding its breadth of services and its geographic reach with thousands of projects performed across the globe in the sulfur, food and grain, marine structure industries.

Together, we provide comprehensive engineering solutions that fit a wide range of unique customer needs and priorities. We are a single streamlined solution provider, serving customers across the globe.

The Matrix family of subsidiaries

Matrix subsidiary lifecycle graph

Matrix Service Company is the parent to a family of subsidiaries that provides engineering, fabrication, construction and maintenance for oil, gas and chemical industries, bulk storage, electrical and industrial infrastructures.

Founded in 1984 with many acquisitions along the way, Matrix Service Company is headquartered in Tulsa, Oklahoma and trades under the NASDAQ symbol MTRX.

  • Matrix PDM Engineering
  • Matrix PDM provides world class, multi-discipline engineering around the world.

  • Matrix NAC
  • Our union labor subsidiary, Matrix NAC provides full service construction, maintenance and repair to energy and industrial customers across North America.

  • Matrix Service
  • Matrix Service provides full service construction, maintenance and repair to energy and industrial customers across North America.

  • Matrix Applied Technologies
  • Headquartered in Tulsa, OK, with regional offices in Seoul, Korea and Sydney, Australia, Matrix Applied Technologies sells aboveground storage tank products and API heaters across the globe.

Community Involvement

Community involvement is more than a core value -- it’s a commitment from all levels of the organization to improve the communities where we live and work. From supporting the United Way and participating in various races to local food drives and holiday gift collections, Matrix employees are passionate about giving back and supporting our communities.

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Bradley J. Rinehart Headshot

Bradley J. Rinehart


Prior to becoming President of Matrix PDM Engineering, Bradley J. Rinehart served as Vice President of Matrix Service from May 1997 to December 2016; Regional Manager – Michigan Region from April 1991 to April 1997; Operations Manager – Michigan Region from January 1990 to March 1991; and as a Project Manager – Michigan Region from January 1988 to December 1989. Mr. Rinehart holds an API-653 certification as well as an installer/inspector certification from the State of Pennsylvania. Mr. Rinehart holds a Bachelor of Science Degree in Construction Science from the University of Oklahoma and is a past board member of the Tulsa Ronald McDonald House.

Kenneth L. Erdmann P.E. Headshot

Kenneth L. Erdmann P.E.

Senior Vice President

Senior Vice President Ken Erdmann holds a Bachelor of Science in Aeronautical and Astronautical Engineering from Purdue University (1990) and a Masters Degree in Civil Engineering from Oklahoma State University. Ken's engineering expertise has focused primarily in civil and structural engineering disciplines with emphasis in computer methods of structural analysis. As the first design engineer hired by Matrix PDM, Ken has over 20 years of experience with the Company. At Matrix PDM he has held positions of Design Engineer (1991-1995), Director of Engineering (1995-2011), Vice President of Engineering (2011-2016), and Senior Vice President (current). In these roles Ken has implemented new computer systems, led new product development and provided strategic planning for the company's engineering services. In industry, Ken has served on various American Petroleum Institute (API) committees and task groups for over 15 years. Under the API Committee on Refinery Equipment, Ken has chaired the manufacturer's and contractor's group and was recently named Chairman of the Design Subgroup for aboveground storage tanks. Ken has 56 professional engineering licenses throughout North America and is the named inventor for various Matrix patents.