EN3 Professionals, LLC was founded in March of 2009 and provides services to a national and selected international client base from its offices in Flagstaff, Arizona, and Traverse City, Michigan.

Principals William M. Auberle, L.H.D., and Charles M. Schlinger, Ph.D., have nation-wide and international project experience, and hold multi-state professional registrations and certifications in civil engineering, environmental engineering, geology and geophysics.

EN3 and its Associates address ENgineering-, ENvironmental- and ENergy-related needs of corporate, governmental, tribal & legal clients, with consideration for all media (water, air, soil, rock).


  • To be engaged in significant, meaningful and productive initiatives…
  • To enhance the built and natural elements of our environment…
  • To advance the practice of our professions…
  • To contribute to the economic vitality of the communities that we serve and inhabit …
  • To design resilient systems and infrastructure…
  • To sustain natural resources…


  • Research
  • Negotiation Support
  • Environmental and Air Quality Project Management, Review, Monitoring and Modeling
  • Energy Use Modeling, Forecasting and Evaluation
  • Renewable Energy Project Development and Management
  • Environmental Permitting & Risk Management
  • Water Resources & Infrastructure Engineering
  • Water & Energy Use Measurements & Monitoring
  • Geophysical/Geological/Geotechnical Project Management, Modeling & Evaluations
  • Civil Engineering Surveying
  • Contaminated Site Assessment and Project Management
  • Expert Witness