Liddell was born in Matamata and attended Mt Albert Grammar School in Auckland before obtaining a Bachelor of Engineering degree with honours from the University of Auckland.
He started his career as an investment banker in New Zealand and from 1999 to 2002 was chief executive of then majority US-owned Carter Holt Harvey, a large New Zealand forestry and paper-making company, having earlier been the chief financial officer.
Liddell relocated to the United States in 2002 where he served as a former chief financial officer of Microsoft and former vice chairman of General Motors before joining the White House ranks in 2018. Recently, he has been part of Trump's inner circle of advisors on the administration's Covid response.
In 2010 he was awarded New Zealand Business Leader of the Year, and appointed a Companion of the New Zealand Order of Merit for services to business and philanthropy in 2016.
Liddell has previously donated $450,000 to the University of Auckland to fund a scholarship to Oxford. He and his brother have also donated $1 million to their former high school, Mt Albert Grammar.
A New York Times article published in 2017 reported Liddell to have stated assets worth between $105m and $280m, making him the eighth richest member of the Trump administration at the time.
Angel Gurría is current OECD secretary general, and is in his third five-year mandate, having been appointed in June 2006.
Founded in 1961, the OECD is a global organisation with 37 member states that works to promote policies that will improve the economic and social wellbeing of people around the world.