Board of Directors

John Busch, PhD, PE

Dr. John Busch has had a 40-year career of professional work in higher education and government service. He has a BS, MS and PhD degrees from Colorado State University and the University of Idaho.

He is a Registered Professional Engineer in Oregon and Idaho. Dr. Busch’s academic career includes 20 years at the University of Idaho and 10 years at LeTourneau University. His technical expertise centered on water resources and irrigation engineering, and he directed statewide research programs and taught various engineering courses. He was major professor for 16 MS and PhD graduate students, some of whom have become recognized nationally and internationally for their continued work.

Richard A. Lewis

Richard Lewis graduated with an MBA in Economics from the University of Chicago, and a BA in Economics from Wesleyan University. Recently retired, he specialized in disability management and helped found immensely successful small businesses, such as the Lewisco Group and Thomas L. Jacobs and Associates, a leading consulting firm and third party administrator of Fortune 500 managed disability plans.

He is co-founder of the National Disability Management Conference and a charter member for the National Business Group on Health's Council on Employee Health and Productivity. He brings to the LIMBS team more than 30 years of experience in successfully running small businesses.

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Roger Gonzalez, PhD, PE

Dr. Roger Gonzalez is Chair and Professor of Engineering Education and Leadership at The University of Texas at El Paso (UTEP) and holds graduate degrees in Biomedical and Mechanical Engineering. He earned his PhD and MS in Engineering from the University of Texas at Austin and his BS in Mechanical Engineering from the University of Texas at El Paso.

He was awarded a prestigious National Institutes of Health (NIH) National Research Service Award (NRSA) for his postdoctoral work in neuromuscular control and musculoskeletal biomechanics on children with juvenile rheumatoid arthritis, while working as a research scientist at Northwestern University Medical School and the premier Rehabilitation Institute of Chicago. His scholarly efforts with students have focused on musculoskeletal modeling, dynamic modeling of human movement and neuromuscular control with applications to upper extremity neuroprosthesis and on the effects of knee ACL-deficiency on osteoarthritis.

Dr. Gonzalez is an Elected Member of the College of Fellows of the American Institute for Medical and Biological Engineering (AIMBE). More than 125 publications detail his research endeavors having received multiple National Science Foundation (NSF), National Institutes of Health (NIH) and Department of Education research grants, including support from various foundations for his international humanitarian endeavors. He has also received the American Society of Engineering Educators (ASEE) Teaching Award, the Minnie Stevens Piper Foundation Award for 2008, and LeTourneau University’s top research and scholarship award. He also serves as an engineering program evaluator for ABET (Accrediting Board for Engineering and Technology), which is the sole U.S. entity for accrediting engineering programs throughout the United States.

As Founder, CEO and President of LIMBS International, Dr. Gonzalez has worked with students in Africa, Asia, Europe, Australia and Latin America on various international engineering research and humanitarian projects.

Eric Minelga

Eric Minelga is an engineering manager for the Boeing Company with the Interiors Responsibility Center. He has led and worked on several custom aircraft interior development programs with key Boeing customers. He is a graduate of Boeing's two-year Leadership, Development, Excellence (LDE) leadership development program. His work with LIMBS began in 2004 as part of the project, which began with design and testing of the LIMBS M1 knee.

He has a BS in Engineering from LeTourneau University, a MS in Mechanical Engineering from the University of Washington and is presently pursuing his MBA at Seattle Pacific University. He raises puppies for Guide Dogs for the Blind and has raised five seeing-eye dogs. He also serves on the Business Council for Hope Foursquare Church.

Angelica Machorro, MD

Dr. Angelica Machorro received her undergraduate degree from the University of Texas at Austin in 1999 and her medical degree from Texas Tech Health Sciences Center in 2003. She completed her pediatric residency training at the University of Texas Health Science Center in San Antonio, Texas.

In 2006, she returned to her hometown of El Paso where she has since been working in private practice. Dr. Machorro is certified by the American Board of Pediatrics.

Dr. Machorro is a member of the American Academy of Pediatrics, Texas Pediatric Society, El Paso Pediatric Society, Texas Medical Association and El Paso Medical County Society.  She also actively participates on several committees at the local children's hospital.
Dr. Machorro has two children and is an active member of their school's Parent Teacher Association.  She recently served as the treasurer on the PTA board.

Bill Mitchell, PhD

Dr. Mitchell has helped many organizations to reach new heights. His 25 years of leadership experience in leading his own organizations as well as his education, provide a background to help organizations reach new heights.

As President and CEO of several large multi-million dollar corporations, he experienced virtually every organizational environment. Today his responsibilities embrace product and service development; sales and marketing; coaching, facilitation and training; and organizational development.

As a professional Pubic Speaker for more than 30 years, he has motivatied audiences in 47 States and 5 continents. His unique conversational style and subtle humor allow him to instruct, inspire and impact audiences from all walks of life.

Dr. Mitchell’s fortes include strategic organizational assessment and alignment, developing training and coaching that produce systemic and sustainable improvement and success

Education: Baylor University; Southwestern, PhD

Mike Williamsen, PhD

Mike Williamsen is a nationally recognized workplace safety consultant with more than 25 years of safety and business change management experience. His background includes serving in Engineering, Operations, and Safety Manager positions for companies such as Frito-Lay, Inc. and General Dynamics. In 1985, Mike teamed with safety author Dr. Dan Petersen for three years to develop and implement a nationwide safety accountability and continuous improvement system that helped a Fortune 20 company reduce injuries by 80% within two years.

Since that time Mike has applied these and other high-impact safety principles with similar success to other Fortune 500 companies, such as General Dynamics, Baxter Healthcare, ATCO Electric, Rohm and Haas Co., and BASF. He received his academic degrees from the University of California, Berkeley (B.S.), California State University, Hayward (MBA) and Columbia Southern University, Orange Coast, Alabama (Ph.D., Business).


Sandra G. Terrazas, PT, MBA

Sandra G. Terrazas, PT, MBA, received  her Bachelor’s Degree in Physical Therapy from Texas Tech Health Sciences Center in 1994.  She received her Master’s Degree in Kinesiology from the University of Texas at El Paso in 2005 and her Master’s in Business from the University of Phoenix in 2008. 

She has been in practice for over 20 years and is the owner of Spectrum Therapy Consultants and Spectrum Fitness in El Paso, Texas.  Her specialties include wound care, women’s health, sports medicine, and orthopedics.  She is adjunct faculty in the physical therapy departments at the University of Texas at El Paso, El Paso Community College, and Western Tech College.

She is a member of the American Physical Therapy Association, Texas Physical Therapy Association, and the Greater El Paso District.  She has been involved for  over 20 years with mission work in Guatemala with Faith in Practice.