Biffas external affairs director Peter Jones is to leave the company after 19 years of service.
He will leave at the end of the month as will director of environment, quality and health and safety Berian Griffiths, after 22 years of service.
The news follows Biffas acquisition by private equity firm WasteAcquisitionco in April.
Interim chief executive Bill Woodburn paid tribute to both Jones and Griffiths.
He said: I would like to place on record my thanks to both Peter and Berian. Both have been great ambassadors for the company, and have made significant contributions to the growth and success of the business over the years. I wish them well for the future.
Image: Biffa external affairs director Peter Jones