Who We Are
Onterris is a global environmental solutions company partnering with organizations to solve complex challenges where environmental pressures, regulatory expectations and operational risks intersect.
Sectors
Access deep environmental expertise tailored to your industry, with solutions built for real-world conditions.
Solutions
Prepare for escalating environmental risks with expert solutions designed to perform under pressure.
Our Thinking
Explore briefs, perspectives and articles that turn insight into action. Discover thought leadership that informs decisions and drives impact. See the ideas shaping environmental solutions and guiding your next move.
Cuture & Careers
Where brilliant people come together to turn environmental science into real-world progress for communities, industry and the planet.

Miguel Fernandez de Castro

Board Member
J Miguel Fernandez de Castro Headshot

Mr. Miguel Fernandez de Castro serves on the Onterris Board of Directors and has been a Director since December 2013. He has served as Executive Chairman of ExamWorks Group, Inc., a provider of independent medical examination services, since January 2026. At ExamWorks, Mr. Fernandez de Castro previously served as Chief Executive Officer from August 2024 to December 2025, Co-Chief Executive Officer from January 2020 to August 2024, and as Chief Financial Officer from March 2009 to March 2025.

Before ExamWorks, Mr. Fernandez de Castro served as Senior Vice President and later Chief Financial Officer and Vice President and Controller at TurboChef Technologies, Inc. Earlier, he held roles at PracticeWorks, Inc. He began his career in the audit services group at BDO Seidman, LLP.

Mr. Fernandez de Castro earned a BA in Economics and Spanish and a Master’s in Accounting from the University of North Carolina at Chapel Hill. He is a Certified Public Accountant in the State of Georgia.