A further trip to the rural valley communities of the KwaZulu-Natal Province in South Africa, where he volunteered with World Vision, saw him return to Melbourne in 2003 and join with Mackay and other young people to establish Oaktree, with the purpose of combating some of the inequalities that Evans had witnessed.

Oaktree runs educational programs that aim to transform Australians into dedicated and effective agents of change in acting on extreme poverty.

The campaign encourages members of the general public in Australia, New Zealand, the United States, and the United Kingdom to participate in order to develop a better understanding of the daily challenges faced by the 1.4 billion people experiencing extreme poverty.

For each of the five days of the campaign the participants are encouraged to limit their food expenditure to the equivalent of the extreme poverty line, set at US$1.25.

[11] In 2020, Oaktree joined the 'End COVID For All' campaign, a collective group of organisations who support the assistance of vulnerable nations in the light of COVID-19.