Senior biochemist who used to work in the NHS in Leeds.
What is he famous for?
Whistleblowing. He alleged that there was scientific fraud and malpractice at Leeds General Infirmary, where he worked.
Inquiries established there was scientific fraud, but Dr Chapman was sacked a day before his 50th birthday, which he said was a move calculated to damage his salary and pension rights. Ten months later, he was reinstated in a three-year research contract with Leeds health authority.
An independent inquiry by former home secretary Lord Merlyn-Rees later criticised management procedures in the chemical pathology department of LGI, confirmed there had been scientific fraud, but found no evidence that there was a conspiracy to get rid of Dr Chapman.
Where is he now?
Unemployed since March 1997, he is analysing the Rees report, which he says failed to examine the evidence and was a 'blatant cover-up'. He hopes to go public on this soon.
How does he feel?
He feels his character was assassinated and that the Goliath of the health and civic establishments are too powerful for his David to defeat.
Would he do it again?
'No. There is no point in sacrificing yourself. I keep telling my children not to do what I've done, although I know it's wrong.'
'I have got a lot of things to be bitter about. I don't think it is wrong for people to be bitter.'
Does the new 'whistleblowers bill' offer hope?
Probably not. Legal facilities to change wrong-doing already exist, he points out.