Former Horizons Regional Council staffer turned environmental consultant Greg Carlyon is the speaker the this week's Whanganui Science Forum.
Mr Carlyon will be speaking at the Davis Lecture Theatre on July 25.
His presentation is called "Horizons Regional Council - Missing in Action?".
Mr Carlyon is now the director of The Catalyst Group, an environmental planning consultancy he set up and runs from Palmerston North.
Topics to be covered in the talk include what is covered by Horizons' One Plan, what independent authorities say about its implementation and what science is telling us about what is happening in the environment.