[1][2] Greenspon was born and raised in Montreal and moved to Ottawa in 1974; he became a civil libertarian before commencing his legal work.
[12] On January 3, 2018, the lawyer representing Joshua Boyle said that the defendant planned to have Greenspon and partner Eric Granger take over the defence against 15 criminal charges.
[13] Boyle is a high-profile defendant because he and his family had been released after five years of captivity in Afghanistan only months before his arrest for offences alleged to have been committed in Ottawa.
[16] In 2022, Greenspon represented the family of a 14-year old boy who climbed through City of Ottawa-erected fencing at the disused Prince of Wales Bridge and drowned after jumping into the Ottawa River.
The family filed a $1.5 million lawsuit against the City alleging that it was negligent for not taking effective steps to stop such incidents at the bridge.