Our Team


Treat headshot

Natalie Hildt Treat became Executive Director of the C-10 Foundation in February 2017. Natalie previously served on C-10’s board of directors, and has a long history of work in environmental and energy issues, public policy and communications. She is honored to succeed long-time Executive Director Sandra Gavutis and Research Director Debbie Grinnell, and looks forward to growing C-10’s membership, diversifying funding and expanding our monitoring network.

Natalie holds a B.A. in Environment and Public Policy from Connecticut College and an M.A. in Communications Management from Emerson College. She lives in an energy-efficient, solar-powered home with her husband Tom and daughter Julia. You can reach Natalie at natalie@c-10.org or connect on LinkedIn.


Mike Mansir is System Administrator for the Citizen’s Radiological Monitoring Network operated by the C-10 Foundation. Mike’s technical background as a software engineer and network administrator makes him invaluable in running the network, which operates on proprietary software with a central station and field sites spread across the Emergency Planning Zone. Mike ensures minimal system downtime by continuously monitoring the uploading of real-time data and overseeing the installation and maintenance of field equipment.

You can reach Mike at mike@c-10.org.

Board of Directors


As a small non-profit, our working board is our lifeblood. We are grateful to the following individuals for serving with us:

Pat Skibbee, Board Chair

Diane Teed, Treasurer

Jack Van Loan, Recorder

Sandara Gavutis, Emeritus Executive Director

Debbie Grinnell, Emeritus Research Director

Erika Didrikson

Sarah Doenmez

Christopher Nord


C-10 staff and board members recently traveled to Washington, D.C. a hearing before the NRC. Pictured, L-R: Diane Teed, Sandra Gavutis, Paul Gunter (of Beyond Nuclear) Debbie Grinnell, Sarah Doenmez, Pat Skibee and Chris Nord (Bottom) (Photo: Lisa Clark).