The Dictionary of American Regional English project is part of the College of Letters and Science at the University of Wisconsin-Madison, where Joan Houston Hall is chief editor.
He does not contest that he sent the letters to three forensic science laboratories, a computer company, an accountancy firm, the DVLA and a residential address, but denies intending to cause injury.
Following a deluge of letters, emails and telephone calls accusing Mann of bad science practices, Penn State found it prudent to conduct an internal investigation.