Our Team

Our forensic engineers are experts in accident reconstruction, failure analysis and cause & origin.

Our forensic engineers work directly with our in-house animation department to create state-of-the-art forensic animations for use in court, arbitration, mediation or settlement negotiations.


Richard M. Ziernicki, Ph.D., P.E., DFE

Principal Engineer

Dr. Ziernicki has evaluated several thousand industrial and vehicular accidents. He has presented papers and lectured at a…

(303) 925-1900

Stanley C. Stoll, M.Eng., P.E., DFE, CFEI, CVFI

CEO - Principal Engineer

Mr. Stoll is the CEO and a Principal Engineer at Knott Laboratory. Mr. Stoll is a board-certified diplomat forensic…

(970) 640-5928

William H. Pierce, P.E.

Director of Engineering

Mr. Pierce joined Knott Laboratory, LLC with experience in premise liability, environmental, vehicle accident…

(713) 252-2709

Cade R. Caldwell, P.E.

Director of Engineering

Mr. Caldwell has investigated cases involving property damaged by fire, flood, moisture intrusion, inadequate drainage, pipe…

(303) 925-1900

Kyle T. Wieghaus, Ph.D., P.E.

Director of Engineering

At Knott Laboratory, Dr. Wieghaus has investigated cases involving residential and large commercial properties damaged by…

(970) 631-5290

Tim R. Phelan, M.S., P.E., S.E, M.L.S.E.

Director of Engineering

Mr. Phelan has investigated cases involving property damaged by fire, flood, moisture intrusion, inadequate drainage, pipe…

(303) 925-1900

Ricky L. Nguyen, M.S., P.E.

Project Manager

Mr. Nguyen received his Bachelors of Science in Engineering with a Mechanical Specialty at the Colorado School of Mines in…

(303) 925-1900

Henry “Hank” V. Mowry, P.E., CFEI

Engineering Manager

Mr. Mowry has worked in the nuclear power industry, chemical production industry in mid-stream oil and gas. As a forensic…


Eric A. Black, M.S., P.E., CFEI, CVFI

Senior Engineer/Fire Investigator

Mr. Black has investigated the cause of damage to properties damaged by fire, flood, moisture intrusion, inadequate…

(303) 925-1900
Jason Cochran

Jason M.K. Cochran, M.S., P.E.

Senior Engineer

Mr. Cochran has investigated hundreds of cases involving property damage, foundation failure, structural member failure,…

(303) 925-1900
Karl P. Mertens, M.S., P.E.

Karl P. Mertens, M.S., P.E.

Structural Engineer

Mr. Mertens has performed structural assessments helping owners understand the existing condition of their building as well…

(719) 493-8364

Scott B. Hargrove, P.E.

Structural Engineer

Mr. Hargrove’s responsibilities have included complete structural engineering for both new construction and remodeled…

(303) 925-1900

Peter W. Korff, B.Sc.

Project Engineer

Mr. Korff earned his B.S. in Mechanical Engineering at Iowa State University.

(303) 925-1900

Samuel R. Henning, P.E.

Project Engineer

Mr. Henning received his Bachelors of Science Degree in Civil Engineering from the University of Colorado in Boulder, CO.…

(303) 925-1900

David C. Neidig, B.Sc.

Project Engineer

Mr. Neidig has worked in laboratory and engineering environments within polyurethane, electronics, and aviation industries.…

Knott-Laboratory-Team-Geoffrey-Siffring (1)

Geoffrey Siffring, B.S. Arch, Assoc. AIA, NCARB

Building Consultant

Mr. Siffring graduated Magna Cum Laude with a Bachelor of Science in Architecture from the University of Colorado, Denver.…

(303) 925-1900

Cameron R. Stoesser, B.Sc.

Project Engineer

Mr. Stoesser graduated from the Colorado School of Mines with a Bachelor of Science in Mechanical Engineering in May 2020.


Garrett Howard

Mechanical Engineering Intern

(303) 925-1900

Steve D. Knapp, P.E., CFEI, CVFI

Senior Consulting Engineer

Mr. Knapp has been working as a forensic engineer since 1999. During this time, the emphasis of his career has been focused…

(303) 925-1900

Mark Kinghorn, B.Arch, AIA

Architectural and Building Consultant

Mr. Kinghorn has broad experience in all aspects of Architecture and General Construction with extensive experience with…

(303) 925-1900

Michael J. Foley, B.S., E.E.

Senior Electro-Forensic Engineering Consultant

Mr. Foley specializes in the investigation of electrical failures and product liability issues with particular emphasis on…

(303) 925-1900

Gary W. Markham, P.E.

Principal Consultant

Mr. Markham specializes in consulting on and leading teams of consultants on very large engineering & construction claims,…

(303) 925-1900

Wojciech Wach, Ph.D.

Senior Scientific Consultant

W. Wach conducts and directs investigations of vehicular accidents, which include automobiles, tractortrailers, buses,…

(303) 925-1900


Taylor D. Spiegelberg, B.F.A.

Senior Visualization Expert

Mr. Spiegelberg is one of our experts in 3D Modeling, Forensic Animation, Interactive Animations, Photo Matching,…

(303) 925-1900

Angelos G. Leiloglou, M. Arch.

Senior Visualization Consultant

Mr. Leiloglou is a native of Texas. He grew up in San Antonio and attended Texas A&M University where he earned a Bachelor…

(303) 925-1900

Business Development

Mike Lowe headshot

Mike Lowe


Mr. Lowe is the President of Knott Laboratory. He comes to Knott Laboratory with a strong construction background. Mr. Lowe…

(303) 925-1900
Justin Bayer headshot

Justin Bayer

Client Relations Manager

Mr. Bayer's background prior to joining Knott Laboratory L.L.C comes from experience in Business Development within the HOA…

(480) 316-1834

Bo Milberger

Client Relations Manager

Bo Milberger is a Colorado native and is a Client Relations Manager with Knott Laboratory.

(303) 801-7635
Sarah Allen marketing manager at Knott Lab

Sarah Allen

Marketing Manager

Sarah Allen has a diverse marketing background across many industries from mountain bike manufacturing to the financial…

(970) 361-0457


Jamie D. Ramirez

Vice President of Administration


Kelly Peppard

Executive Case Manager

(303) 925-1900

Karen Mellentine

Business Process Manager

(303) 925-1900

Julie Cox

Accounting Clerk

(303) 925-1900