Last month, I called for the World Bank to be led by a global development leader rather than a banker or political insider.
"The bank needs an accomplished professional who is ready to tackle the great challenges of sustainable development from day one," I wrote. Now that Barack Obama, the US president, has nominated Jim Kim for the post, the world will get just that: a superb development leader.
Mr Obama has shown real leadership with this nomination. He has put development at the forefront, saying explicitly: "It's time for a development professional to lead the world's largest development agency."
Mr Kim's appointment, if it happens, will be a breakthrough for the World Bank, which I hope will extend to other global institutions. Until now, the United States had been given a kind of carte blanche to nominate anyone it wanted to the World Bank presidency. That is how it ended up with several inappropriate leaders, including a number of bankers and political insiders who lacked the knowledge and interest to lead the fight against poverty.
Mr Kim is one of the world's great leaders in public health. He has worked with another great public-health leader, Paul Farmer, to pioneer the extension of treatment for AIDS, tuberculosis and other diseases to the world's poorest people. More recently, he has been the president of Dartmouth College, a leading American university. He therefore combines professional expertise, global experience and considerable management know-how - all perfect credentials for the World Bank presidency.
I have worked closely with Mr Kim over the years. He is a visionary, seeing the possibility of providing care where none is yet available. He is bold, ready to take on great challenges. And he is utterly systematic in his thinking, designing new protocols and delivery systems for low-income communities. He led the effort by the World Health Organisation to scale up AIDS treatment for people in low-income countries, and he did an exemplary job.
The US nomination is not the end of the story. The World Bank's 25 executive directors, representing 187 member countries, must now confirm the choice from among three nominees. He faces a challenge from Nigeria's esteemed finance minister, Ngozi Okonjo-Iweala, and Colombia's former finance minister, José Antonio Ocampo. Yet Mr Kim is the overwhelming favourite to get the position, especially given his stellar global record of accomplishment.
The past month has brought other reminders of why the bank counts so much, and why I emphasised the urgent need to professionalise its leadership. Tragically, the government of Mali was overthrown in a military coup. Ironically, an election was scheduled for this spring, so the country was to have a new government soon.
I link the coup and the World Bank for the following reason: Mali is yet another example of a country where extreme poverty, hunger, disease, drought, and famine cause political instability and violence.
I know the country well. The Earth Institute (which I direct) has a large office in Mali. Several years ago, Mali's government appealed to me for help to fight the country's worsening poverty. I tried to rally global support for Mali, but the bank and others barely responded. They did not see the dangers that were so evident to all of us working in villages around the country.
Around the world, poverty is the basic condition that accelerates and intensifies violence.
This year's drought made a bad situation in Mali much worse. I have been saying and writing for years that the dryland regions stretching west to east - from Senegal to Mali, Niger, Chad, Sudan, Somalia, Yemen, Iraq, Iran, Pakistan, and Afghanistan - are a growing tinder box, where climate change, drought, hunger and population growth are creating ever greater instability.
That instability erupts into war with terrifying frequency. Sustainable development is the only path to sustainable peace.
The US government is finally waking up to this new and frightening reality. An assessment by America's intelligence agencies, released last month, argues that, "during the next 10 years, water problems will contribute to instability in states important to US national security interests". Of course, not only US security is at stake; so are global security and the survival and well-being of vast numbers of people. And there is no need to wait for the coming 10 years: the grim reality predicted in the report is already with us.
All of this underscores the importance of the World Bank and Mr Kim's role at the helm. The bank can be where the world convenes to address the dire, yet solvable, problems of sustainable development. Mr Kim's nomination is a tremendous step toward that goal.
Jeffrey Sachs is a professor of economics and the director of the Earth Institute at Columbia University. He is also a special adviser to the UN secretary-general on the Millennium Development Goals
* Project Syndicate