PPI’s Management Structure includes a six-person Board of Directors, many of whom are also Department Managers, other Department Managers, and Satellite Office Managers.


  • Mr. Brad R. Parrish, P.E., President
  • Mr. Brandon R. Parrish, P.E., Vice President
  • Ms. Rachel J. Goeke, P.E., Client Services Manager
  • Mr. Shane M. Rader, P.E., Drilling Services Manager
  • Mr. Donald C. Nowack, P.E., R.G., Environmental Services Manager
  • Mr. Mike Foley, Construction Materials Testing Manager

Additional Management Staff

  • Mr. Joshua Elson, R.G., Geophysics Department Manager
  • Mr. Danny Flannery, Branson Office Manager
  • Mr. Rick Hundley, Joplin Office Manager
  • Mr. Nick Ward, Tulsa Office Manager
  • Mr. Jeremy Mitchell, Quality Manager

Mr. Brad R. Parrish, P.E.
Mr. Brad Parrish, P.E. co-founded PPI in Springfield, Missouri in January 1989, and has served as PPI’s President since 2004.  Mr. Parrish is an alumni of the Missouri University of Science and Technology, having earned his Bachelor of Science and Master of Science in Civil Engineering in 1977 and 1978 (Geotechnical Emphasis).

Mr. Parrish is a native of Greene County, and a graduate of Willard High School.  Under his leadership, PPI has grown to include a full-time staff of over 50 employees, four offices, extensive laboratory testing capabilities, and drilling resources that are unmatched for a Company of PPI’s size.   

Mr. Parrish’s credentials include Professional Engineering Licenses in Missouri, Kansas, Oklahoma, and Arkansas; Certified Welding Inspector (CWI); registration as a Kansas Water Well Contractor; and a Restricted Monitoring Well Installer License in Missouri. 

Mr. Parrish has served as a local and state Officer for the Missouri Society of Professional Engineers, in various capacities for the American Council of Engineering Companies (ACEC), and is a member of the Academy of Civil Engineers at the Missouri University of Science and Technology.


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Mr. Brandon R. Parrish, P.E.
Vice President
Mr. Brandon Parrish, P.E. joined PPI as a full-time employee in 2006 after earning his Bachelor of Science and Master of Science in Civil Engineering from the University of Missouri (Geotechnical Emphasis).  Mr. Parrish is a graduate of Willard High School, and has been involved with the Company business for most of his life.

Mr. Parrish is PPI’s Geotechnical Engineering Manager, and has particular expertise with Subsurface Investigations, Geotechnical Laboratory Testing, Shallow and Deep Foundation Design, and Retaining Wall Design.   PPI’s Geotechnical Laboratory Testing capabilities have expanded under Mr. Parrish’s leadership, and include expertise with Direct Shear, Consolidation, and Remolded Hydraulic Conductivity Testing, among other things.

Mr. Parrish has established an excellent reputation with many of PPI’s Clients in the Transportation Industry, and is the primary Project Manager for PPI’s on-call Geotechnical Services Contract with KDOT and many of PPI’s MoDOT Projects.

Mr. Parrish is involved with the Missouri Society of Professional Engineers at the local and state levels.  Mr. Parrish maintains a Professional Engineering license in the States of Missouri, Kansas, Oklahoma, Texas, Iowa, Louisiana, Mississippi, West Virginia, and Wyoming.


Ms. Rachel J. Goeke, P.E.
Client Services Manager
Ms. Rachel J. Goeke, P.E. joined PPI in January 2006 after beginning her career in St. Louis, Missouri.  Ms. Goeke is a 2002 and 2003 graduate of the Missouri University of Science and Technology, with a Bachelor of Science and Master of Science in Civil Engineering (Geotechnical Emphasis).  Ms. Goeke is a Branson High School graduate and has enjoyed the opportunity to work and live in southwest Missouri. 

As PPI’s Client Services Manager, Ms. Goeke’s responsibilities include Contract Management, Project Management, and Business Development.  Ms. Goeke has been instrumental in PPI’s growth in the Government, Transportation, and Utility Sectors.  On the technical side, Ms. Goeke has considerable experience with analysis and design of earthen dams, retaining walls, and slope repair, among other things.

Ms. Goeke is a licensed Professional Engineer in the State of Missouri, and is involved with the Missouri Society of Professional Engineers, Professional Engineers in Private Practice, and Society for Marketing Professional Services.




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Mr. Shane M. Rader, P.E.
Drilling Services Manager
Mr. Shane M. Rader, P.E. joined PPI in 2002 after graduating from the Missouri University of Science and Technology with a Bachelor of Science degree in Geological Engineering.  Mr. Rader is a graduate of Lebanon High School, and has established his family in Republic, Missouri.

Mr. Rader has worked as PPI’s Drilling Services Manager since 2006, and has developed an unmatched knowledge of the subsurface geology in the Region.  The resources and capabilities of PPI’s Subsurface Drilling Department have grown tremendously under Mr. Rader’s leadership, making PPI well-equipped to respond to almost any request for subsurface exploration.

Mr. Rader is a licensed Professional Engineer in the State of Missouri.  Mr. Rader is involved with the Missouri Society of Professional Engineers, has served as an officer of the Ozark Chapter of Professional Engineers in Private Practice, and was a member of the 2014 American Council of Engineering Companies (ACEC) Missouri Future Leaders Academy.  Mr. Rader is a member of the National Drilling Association (NDA), a licensed drilling/pump operator in Oklahoma, and maintains a restricted Missouri Well Driller’s License.




Mr. Donald C. Nowack, P.E., R.G.
Environmental Services Manager
Mr. Donald C. Nowack, P.E., R.G. has managed PPI’s Environmental Services Department since joining the Company in 2007.  Mr. Nowack is an Ozark, Missouri native and a graduate of Ozark High School.  Mr. Nowack received a Bachelor of Science in Geology from Missouri State University in 1997 and a Bachelor of Science in Geological Engineering from the Missouri University of Science and Technology in 2003.

Mr. Nowack has broad knowledge of the Environmental Services field, and particular expertise in areas including Phase I and Phase II Environmental Site Assessments, Missouri Risk Based Corrective Action Assessments, Subsurface Exploration, Groundwater Monitoring, and Geologic Assessments.  Mr. Nowack supervises PPI’s geologist staff, and completes numerous geologic evaluations, karst investigations, and sinkhole evaluations each year.

Mr. Nowack is a licensed Professional Engineer and Registered Geologist in the State of Missouri.  His credentials include an Asbestos Inspector License in the State of Missouri, and involvement with the Missouri Society of Professional Engineers and Professional Engineers in Private Practice.




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Mr. Mike Foley
Construction Materials Testing Manager
Mr. Mike Foley has been instrumental in the growth and management of PPI’s Construction Materials Testing Department since joining PPI in 1991.  Mr. Foley is a native of St. Joseph, Missouri, and received a Bachelor of Science Degree in Construction Engineering Technology from Missouri Western University in 1989.

As PPI’s Construction Materials Testing Manager, Mr. Foley oversees dispatch of PPI’s Springfield Field Technicians, supervises PPI’s construction materials testing laboratories (soil, concrete, aggregate, and asphalt), and is involved with Business Development for PPI’s Springfield Office as well as PPI’s Satellite Offices in Joplin, Missouri, Branson, Missouri, and Tulsa, Oklahoma.

Mr. Foley serves as PPI’s Radiation Safety Officer (RSO) and maintains PPI’s nuclear gage compliance in Missouri, Arkansas, Kansas, and Oklahoma.  Mr. Foley is actively involved with the Concrete Promotional Council and helps facilitate the ACI Field Level 1 Certification at PPI’s Springfield Office twice each year.




Mr. Joshua Elson, R.G.
Geophysics Department Manager
Mr. Joshua Elson, R.G. joined PPI in 2013 after graduating from Missouri State University with a Bachelor of Science degree in Geology and Geography.  Prior to obtaining his Geology degree, Mr. Elson served as a Weather Forecaster for the 207th Weather Flight in the Indiana National Guard from 2000 to 2006.

As Geophysics Department Manager, Mr. Elson works closely with PPI’s Geotechnical Engineering Project Managers to incorporate geophysical survey methodologies into appropriately-scoped subsurface investigation programs.  Mr. Elson has extensive project experience and educational training with Multi-Channel Analysis of Surface Waves (MASW) and Seismic Refraction geophysical survey methodologies. 

Mr. Elson is a member of the Environmental and Engineering Geophysical Society (EEGS) and attended the 2015 EEGS Conference in Austin, Texas.  He is also a member of the Geological Society of America and Association of Missouri Geologists.

Mr. Danny Flannery
Branson Office Manager
Mr. Flannery has worked as a Construction Materials Technician in PPI’s Branson Office since 1998, and assumed the role of Branson Office Manager at the end of 2016.  Mr. Flannery is a lifetime Taney County resident, and has seen several growth cycles in the region.

Danny has extensive training and work experience with concrete sampling and testing, field density testing of soil, aggregate, and asphalt; reinforcing steel observation; structural steel inspection; shot rock fill placement and compaction; subgrade stabilization; retaining wall construction; and numerous other aspects of the industry.

Mr. Flannery’s qualifications include ACI Level I Field Technician; MoDOT Certified Technician for soils, concrete, aggregate, and asphalt; and AHTD Certified Technician.

Mr. Rick Hundley
Joplin Office Manager
Mr. Rick Hundley joined PPI in 2005, after serving in the United States Navy for 20 years.  While in the Navy, Mr. Hundley worked in the Commercial Construction Division (SeaBees), and went through the Navy’s Construction Inspection and Construction Management Schools.  Mr. Hundley was promoted to his current position as PPI’s Joplin Office Manager in 2012.

Since joining PPI, Mr. Hundley has obtained certifications including Ultrasonic Testing (UT) ASNT Level I and II, Ground Penetrating Radar (GPR) Level 1, ACI Level I Field Technician, and MoDOT Certified Technician.  Mr. Hundley’s areas of expertise include structural steel inspection (visual weld and bolt inspection, magnetic particle testing, and ultrasonic testing), GPR, concrete sampling and testing, reinforcing steel observation, soil placement and compaction, subgrade stabilization, and retaining wall observation.

Mr. Nick Ward
Tulsa Office Manager
Mr. Nick Ward joined PPI in September 2006, after working in the Non-Destructive Testing (NDT) industry for several years.  Mr. Ward was instrumental in establishing several Client relationships as PPI expanded our Construction Materials Testing services further into Northeast Oklahoma, and was promoted to the role of Tulsa Office Manager in 2010.

Mr. Ward’s qualifications include American Society for Nondestructive Testing (ASNT) Level III for Ultrasonic Testing (UT) and Magnetic Particle Testing (MT) and Level II for Visual Testing (VT) and Liquid Penetrant Testing (PT).  Mr. Ward is an ACI Level I and II Field and Laboratory Technician, has received Troxler Radiation Safety Training, and ODOT-certified Technician in soils, aggregate, concrete, and asphalt.

Mr. Jeremy Mitchell
Quality Manager
Mr. Mitchell has been employed in the Construction and Subsurface Exploration Industry continuously since 1995.  Mr. Mitchell worked as a Field and Laboratory Technician with PPI from 1995 to 1999, and returned to PPI in 2014 to assume the role of Quality Manager.  His responsibilities include quality control for all of PPI’s geotechnical soils and construction materials laboratories, scheduling oversight of PPI’s geotechnical and construction materials testing laboratories, and assistance with the Construction Materials Testing (CMT) Department schedule as necessary.

Mr. Mitchell’s certifications include MoDOT Level I for concrete, aggregate, and PI, ACI Level I Field Technician, and Troxler Radiation Safety Training.  Mr. Mitchell has become actively engaged with AASHTO in 2017, and oversees PPI’s AASHTO and USACE laboratory certifications.