One of the country's best-known developers has claimed that the actions of Nama "destroyed" his business.
Johnny Ronan says the agency was "hell bent" on taking down his company Treasury Holdings.
He also said that if it had agreed to provide funding for a landmark project in London, his company would have been able to repay all its debts.
In written evidence to the Banking Inquiry he also complained that that as the world's biggest real estate agency, Nama should have been run by people with experience in the field, and not run by civil servants.
He said this was like asking "a butcher to perform heart surgery".