Tom Henderson, the founder and former chief executive of the disaster relief charity ShelterBox, has denied charges of attempted theft and conspiring to defraud the charity.
Henderson, 64, from Helston in Cornwall, entered the plea by video link at a hearing at the Old Bailey in London on 20 March.
He was dismissed from the disaster relief charity in 2012 after allegedly carrying out a five-year scam at the organisation between 2007 and 2012.
It is claimed that Henderson also tried to steal 1,000 tents from the charity, which provides emergency shelter and supplies to disaster-hit communities.
Henderson’s son John, 35, from Hayle in Cornwall, appeared at the Old Bailey by video link to plead not guilty to charges of conspiracy to commit fraud and possession of a firearm.
Darren Gervis, 42, from Beaminster in Dorset, who is accused of assisting the Hendersons to hide the fraud by setting up a company, also denied the charge of conspiracy to commit fraud, and also appeared by video link.
The trial is due to start at the Old Bailey on 21 September and is expected to last for 10 weeks. All three men remain on bail.