About GeoTol Inc.

GeoTol Material Authors

Scott Neumann is President of GeoTol. He graduated from The University of Florida with a bachelor’s degree in Mechanical Engineering. He specializes in geometric tolerancing product definition, tolerance stack-up analysis, measurement data and inspection techniques. Scott has presented hundreds of geometric tolerancing training programs to engineering, manufacturing, and quality personnel at major corporations in the US and worldwide since 2007. He has also practiced consulting and mentoring to improve product documentation and inspection methods on a variety of products. The industries include aerospace, defense, automotive, medical, industrial, and consumer products. He has coauthored three textbooks and video programs on the subject: GeoTol Pro 2020 to ASME Y14.5-2018, GeoTol Pro to Y14.5-2009, and GeoTol Applications and Tolerance Stacks. Scott is 2009 Senior Level GDTP certified to ASME GD&T certification Y14.5.2 and is an active member of the following committees related to GD&T:

• ASME Y14.5 Dimensioning and Tolerancing (Vice Chair)
• ASME Y14.5.1 Mathematical Definitions of Dimensioning and Tolerancing (Vice Chair)
• ASME Y14.5.2 Certification of Dimensioning and Tolerancing
• ASME Y14.45 Measurement Data Reporting
• AED Assembly Level Tolerancing
• Y14 US TAG Support Group in the ISO-GPS and ISO-TPD committees

Al Neumann (retired founder) was devoted to education and training in geometric tolerancing and product definition for over 40 years. Al Neumann is a graduate of Central Michigan University. He has worked in a variety of engineering and manufacturing firms related to automotive, aircraft, medical, and the defense industry. Al Neumann is a recognized international expert in geometric dimensioning and tolerancing and has written five books and produced four video training programs on the subject. Mr. Neumann has presented hundreds of training programs to people throughout the US and worldwide over 35 years. He served as a member on the ASME Y14.5, Dimensioning and Tolerancing committee for 35 years. He was section sponsor on the Datum Reference Frame section for the ASME Y14.5-2009 standard, and vice chairman for ASME Y14.5-2018. He was a member on the ASME Y14.5.1, Mathematical Definitions of Dimensioning and Tolerancing for 25 years. He also served as chairman on the US TAG to ISO TC213 on Dimensioning and Tolerancing.

GeoTol Trainers

Matt Taylor is a GeoTol instructor specializing in Geometric Dimensioning and Tolerancing (GD&T) and 3D tolerance analysis. He holds a Bachelor of Science in Mechanical Engineering from Northern Arizona University and is an ASME Certified Educator.

With over 30 years of experience in dimensional management and GD&T, Matt has trained and consulted with engineering and manufacturing professionals at major organizations including Siemens, GM, John Deere, Hewlett Packard, Boeing, Spirit AeroSystems, Northrop Grumman Ship Systems, and Raytheon. He is a specialist in 3D tolerance analysis using Siemens Variation Analysis (formerly VSA), helping design teams optimize design intent before production begins.

Prior to joining GeoTol full-time in 2023, Matt spent nearly 15 years at Raytheon Missile Systems as a Senior Principal Manufacturing Engineer, where he led the Digital Manufacturing team — conducting 3D tolerance analysis and assembly simulations to improve design quality and vet manufacturing processes. Before that, he served for over 13 years at Siemens PLM Software as a Senior Implementation Engineer, working in dimensional management consulting roles across the aerospace, automotive, and industrial sectors. He obtained his ASME GD&T Professional certification in 2010. Matt is an active member of ASME Y14.5.1 Mathematical Definitions of Dimensioning and Tolerancing Committee.

Paul Drake, P.E. is a GeoTol instructor specializing in Geometric Dimensioning and Tolerancing (GD&T), tolerance stack-up analysis, and Design for Six Sigma (DFSS). He holds a Bachelor of Mechanical Engineering from the Georgia Institute of Technology and a Bachelor of Arts in Physics from the University of the South, Sewanee, TN.

With over 35 years of mechanical design and engineering experience, Paul has worked across industries including defense, aerospace, and optics. He spent nearly two decades at Raytheon Systems (formerly Texas Instruments), where he co-founded and managed the Mechanical Tolerancing and Performance Sigma Center for Excellence, developing and deploying best practices across multiple divisions. He later founded MechSigma Consulting, Inc., where he collaborated with major companies on dimensional management, GD&T, and Six Sigma methodologies. Paul is the editor and primary author of the Dimensioning and Tolerancing Handbook (McGraw-Hill) and holds three U.S. patents related to mechanical tolerance analysis. He has joined GeoTol as an instructor since 2022.

Paul is an ASME Senior Level Certified GD&T Professional (GDTP S-0176), a Registered Professional Engineer in Texas (P.E. 74433), and a Six Sigma Blackbelt. He is an active member of the following committees related to GD&T:

• ASME Y14.5 — Dimensioning and Tolerancing (Former Chair, Current Member)
• ASME Y14.5.2 — Certification of GD&T Professionals (Former Vice Chair)
• ASME EAPT — Executive Advisory Team

Brent Bumford is a GeoTol instructor specializing in geometric dimensioning and tolerancing (GD&T), CNC programming, and advanced machine tool applications. He holds a Master Certificate in Six Sigma from Villanova University and is an ASME Certified Educator.

With over 29 years of hands-on manufacturing and machining experience, Brent brings a deeply practical perspective to geometric tolerancing training — connecting product definition standards directly to shop floor application. He has worked extensively with multi-axis and multi-tasking CNC machines, including probing and in-process measurement, and has broad experience across manual machining, EDM, and additive manufacturing. His platform expertise includes Mastercam, SolidWorks, CATIA, Fanuc G-code, and Mazatrol. He has delivered onsite and online training and consulting to industrial corporations and government agencies since 2015, serving industries including aerospace, automotive, medical, and consumer product R&D.

Brent holds multiple professional certifications, including ASME Y14.5 Certified GD&T Professional (GDTP T-0861), NIMS Certified Inspector, NIMS Certified G&T Trainer, CMTSE (Certified Machine Tool Sales Engineer), and Lean Six Sigma Black Belt. He has presented geometric tolerancing training to engineering, manufacturing, and quality teams worldwide.

Edward McCarthy is a GeoTol instructor specializing in product definition, design intent, and technical data packaging per ASME Y14 standards. Edward began his career with the U.S. Air Force Communication Command, working within an Engineering Squadron to develop military engineering programs.

With over 40 years of industry expertise, Edward has trained thousands of engineering, manufacturing, and quality professionals in Print Reading, Geometric Dimensioning and Tolerancing (GD&T), Geometric Tolerancing Applications, and Tolerance Analysis. His experience spans an exceptionally broad range of industries, including Department of Defense projects, aerospace, expandable space stations, electron beam accelerators, semiconductor robotics, laser imaging systems, linear accelerator systems, medical devices, and weapons and missile systems. Since 2017, he has provided consulting, mentoring, and formal training services focused on product definition and inspection, and has created specialized training materials for numerous companies throughout his career.

Edward holds Senior Level GDTP certification under ASME Y14.5.2 and was a past member of the following committees related to GD&T:

• ASME Y14 Main Committee — Engineering Product Definition and Related Documentation Practices
• ASME Y14.5 — Dimensioning and Tolerancing
• ASME Y14.8 — Castings, Forgings, and Molded Parts
• ASME Y14.39 — Limits and Fits
• ASME Y14.43 — Dimensioning and Tolerancing Principles for Gages and Fixtures
• ASME Y14.45 — Measurement Data Reporting