Richard McLaren will head the World Anti-Doping Agency's investigation into allegations of doping at the 2014 Winter Olympic Games in Sochi.
WADA announced the appointment on Thursday, with McLaren to work independently in wake of last week's CBS 60 Minutes report, which claimed that four unnamed Russian gold medallists were among the athletes to have taken banned substances at the Games in Russia.
McLaren was part of WADA's three-person independent commission which uncovered widespread systematic doping in Russian athletics.
"WADA is grateful to Richard McLaren who has, once again, agreed to join a WADA Investigation Team," said WADA president Craig Reedie.
"As President of WADA, I felt that it was in the best interest of clean athletes that we obtain the evidence as quickly as possible. Given the sentiments expressed by many of a perceived conflict of interest, we did what's necessary to follow through on our commitment to get to the bottom of these allegations; while, seeing that impartiality and transparency prevail."
Director General David Howman added: "With the help of Professor McLaren, we will now gather and review all evidence to determine if there have been any violations to anti-doping rules, or any other rules or laws.
"Once the investigation is concluded, WADA will publish a full report and make available all pertinent evidence. If it is found that there have been violations of the World Anti-Doping Code, WADA will ensure that individuals or organizations concerned are dealt with in an appropriate fashion."