[7] As a prosecutor, Tedeschi was best known for the prosecution of numerous high-profile cases in Australia, including the backpacker murders committed by Ivan Milat in the 1990s.

Tedeschi prosecuted the backpacker murders committed by Ivan Milat in the 1990s, in which a total of seven bodies were discovered in the Belanglo State Forest in New South Wales.

[8] Tedeschi successfully prosecuted Chew Seng Liew and Choon Tee Lim for the 1991 shooting death of prominent Australian heart surgeon Victor Chang.

Tedeschi was the lead prosecutor in a trial arising out of the infamous 2000 Fijian coup d'état led by George Speight.

The deaths were found to have been deliberate at the Inquest by an Australian coroner, who ruled that they were killed by Indonesian special forces soldiers.

[8] Tedeschi prosecuted Phuong Ngo for the assassination of New South Wales Member of Parliament John Newman.

This was the first political assassination in modern Australia's history and the trial ended in two mistrials before Ngo was found guilty of the murder in 2001.

Chief Justice Murray Gleeson said, in a unanimous judgement: "The trial of the appellant miscarried principally because of an error which resulted in large part from the failure of the prosecuting authorities adequately to check aspects of the Jayewardene theory.

This was compounded by what I regard as an inappropriate and unfair attempt by the Crown to persuade the jury to draw inferences of fact, and accept argumentative suggestions, that were not properly open on the evidence.

[36] Chief Judge Peter McLellan made numerous critical references to Tedeschi's presentation of evidence, concluding: "The difficulties which the prosecutor's conduct created are so significant that I am satisfied it caused the trial to miscarry occasioning a miscarriage of justice.

In December 2017, Tedeschi wrote two email messages to state prosecutors, arguing that some of his colleagues were making inappropriate concessions to the defence.

[41] In 1975 he was appointed as a lecturer in law at the Kuring-Gai College of Advanced Education (subsequently part of the University of Technology Sydney).

[49] A book of his photographs was published by Beagle Press in 2012 entitled Shooting Around Corners, which featured over twenty-five years of his photography.

[53] In March 2022, Tedeschi released another book, Missing, Presumed Dead, detailing the murders committed by Bruce Burell.

[59] In 2009 Tedeschi was made a Cavaliere Ordine al Merito della Repubblica Italiana or Knight of the Order of Merit of the Italian Republic.