Amb. Mark Andrew Green (ret.) became President & CEO of ONE in May 2026, bringing decades of experience in public service, diplomacy, development, and advocacy.
But titles only tell part of the story.
From teaching in a village in Kenya to serving as U.S. Ambassador to Tanzania, from helping advance landmark global health initiatives to leading some of the world's most influential development institutions, Mark's career has been shaped by a simple belief: everyone deserves the opportunity to build a better future.
We asked Mark about his journey, what brought him...
ONE
ONE's President and CEO urged policymakers to expand support for domestic resource mobilization.
Here's everything you need to know about how we're celebrating Africa Day here at ONE.
Three years into a forgotten war, a seven-day journey through Port Sudan and Khartoum bearing witness to destruction, and to an extraordinary resilience.
In early April, the ONE North America team traveled to Sudan alongside six journalists. Three years into a war that is largely absent from international headlines, the trip was never only about bearing witness to tragedy. It was about telling the story of a people who refuse to stop hoping. Here is what we saw.
Day 1: Arrival in Port Sudan
Port Sudan International Airport
Landing from Addis Ababa, it is immediately clear that...
These Black athletes are shaping a new narrative for future generations and breaking barriers in traditionally underrepresented winter sports.
What we do
We’re a non-profit organization with a 20-year history of fighting for a more just world.
We focus on advocacy, meaning we drive attention and public support to policies that create healthier lives and economic opportunities in Africa. We’re not a charity or grantmaking organization, and we don’t provide direct aid to implementing programs on the ground. We raise awareness around some of the biggest global challenges around inequity and instability and make a data-driven case for change.
We are strictly nonpartisan and...
This Africa Day, ONE set out to do more than just celebrate. We wanted to spark conversations, shift perspectives, and show the real return on investing in Africa. So we brought the party (and the policy) to Capitol Hill, where energy was high and Africa was front and center.
A Return, Not a Risk
We kicked things off in the House of Representatives with a reception that made one thing clear: Africa is a place where trade and investment can thrive....
Springtime in Washington, DC means one thing...
The ONE Power Summit is back! ONE's annual gathering of US activists arrived at a pivotal time: Following disruptions to US foreign assistance and USAID, activists headed to Congress to make sure lawmakers know that investments in effective, accountable foreign assistance programs are investments in a safer, stronger future for us all.
By The Numbers
111 activists traveled to Washington DC for the Power Summit, representing 41 different states!
Our youngest activist in 2025 was...
A pause to US foreign assistance impacts millions of of people around the world. It also impacts Americans.
Foreign assistance is an incredible US legacy, lifting millions of people out of poverty and giving them the resources they need to lead healthy, thriving lives – the lives ONE believes everyone, everywhere deserves a chance to live.
But foreign assistance isn’t the only tool in America’s arsenal to fight global extreme poverty. Private sector investment in developing countries can be a transformative influence, creating much needed economic growth and building on the support foreign assistance provides, eventually reducing the...