In a statement, the probation officers’ union said the decision followed a “difficult employment tribunal”.
Ian Lawrence has been appointed as acting general secretary.
The statement goes on: “Jonathan has had a long career with Napo and we thank him for all the work he has done for members and wish him well for the future.”
Jonathan Ledger late last night tweeted: “You may have noticed I’ve been quiet. Sadly, I have taken the decision not to stand for re-election as Napo’s GS and have now stood down …
“Can’t say anymore but want to thank everyone on Twitter. I hope to tweet again some day …
“I may not be in my role but my support and solidarity will remain with Napo members and the work of Probation and the Family Courts.
“Keep up the fight for what we all value and believe in. My very best wishes to you all. Farewell.”
His Twitter account has since been deleted. There is no formal announcement on the NAPO website.
Jonathan Ledger became General Secretary of Napo in June 2008. He is Napo’s chief negotiator and is the union side Secretary of the National Negotiating Council for the Probation Service. He is a member of the Executive of the General Federation of Trade Unions and a member of the Justice for Colombia National Committee.
Jonathan was National Chair of Napo from 2000-2002 when he was appointed the union’s Assistant General Secretary with responsibility for negotiations and trade union organisation.
Jonathan started his career as a Probation Officer in Hertfordshire in 1984 before moving to London where he worked in Hackney, Camden and Tower Hamlets. He spent some years as a specialist Sex Offender worker and, more generally, worked with high risk individuals in prisons and the community.