Denis heads the private foundation established by global entrepreneur Jorge Paulo Lemann to increase the quality of public education in Brazil. He is also chairman of the board of Instituto Sou da Paz and serves on other boards in the areas of education, human rights and public safety. Before joining the Foundation, Denis was founder and Executive Director of Instituto Sou da Paz, a leading Brazilian NGOs focused on violence prevention. He has contributed to the approval of the “Disarmament Statute,” one of the most modern pieces of legislation to control the use of guns. After being enacted, the law helped reduce homicides for the first time in decades in the country - thousands of lives have been saved. By developing several crime prevention projects with young people in the most violent places in Sao Paulo, and working to improve the work of the police and criminal justice systems, Sou da Paz has helped more than a million people. Its work has been recognized as one of the reasons why the city of Sao Paulo was able to reduce by 80% its homicide rate in the last decade.