Colleagues have paid tribute to the "tireless advocate" for the environment and urban parks Nick Reeves, who died earlier this month after a short illness.
Reeves was head of policy and deputy director of the Institute of Leisure and Amenity Management until 1998, before taking over as executive director of the Chartered Institution of Water & Environmental Management (CIWEM).
A co-founder of the Green Flag Awards and fellow of the Institute of Horticulture, he was awarded an OBE in 2011 for services to the environment. More recently, Reeves played a leading role as a co-sponsor of and driving figure behind the creation of the Parks Alliance, formed to represent the embattled parks sector.
The CIWEM said it has "lost a tireless advocate for the environment and an enthusiastic, committed and visionary leader".
Chair of trustees Jim Oatridge added: "Nick's energy at the helm of the institution was an inspiration to us all. We will honour his memory by continuing to strive for a sustainable, resilient world - the work that Nick was so passionate about. Our thoughts are with his wife, Janet, and their family during this incredibly difficult time."
Dr Sid Sullivan, a co-sponsor of the Parks Alliance, said: "It was a privilege to know and work with Nick. His involvement with and knowledge about the sector and contribution to the Parks Alliance were immense.
"His energy, boundless enthusiasm and keen strategic sense of direction helped shape and prepare the Parks Alliance so that it might position itself to effectively argue the case for funding and raise awareness of parks' enormous civic contribution.
"Nick was also very good company and a born leader who revelled in making contact with people and ensuring that their views were listened to and incorporated. His is a tragic loss to his family and our sector."