In helping the poor, the Boston native, then in his 30s, said he found a happiness that he hadn't before experienced. He turned that experience and expanded it into what is now the Agape Association of El Salvador, a nonprofit with a $13 million annual budget and, with more than 700 permanent staffers, one of the biggest employers in the country.
Known simply as Agape, the Greek word for unconditional love, the organization runs homes for the elderly, a nascent university for low-income students, clinics, mobile medical services, a restaurant, a hotel, training centres, a TV station and a radio station, among its most notable programs. The Franciscan-founded association has earned multiple international as well as national awards from the Salvadoran Association of Industrialists for its entrepreneurship.
Franciscan Father Jack Hoak, named general director in 2012, said though Agape operates on a business model, the Franciscan spirit and St. Francis' ideals of humanizing the poor and creation, flow throughout Agape in its training, in the way employees are encouraged to treat one another as well as those they serve. Staffers attend Franciscan-style retreats and are encouraged to explore the charism of the Franciscans, particularly as it pertains to the poor.
"We want the poor to have opportunities and that was the intention of the founder," said Father Hoak in an interview with Catholic News Service.
In a country racked with everything from war, natural disasters including earthquakes and hurricanes, and government corruption, Agape has remained a stabilizing presence.
"By combining social commitment with business innovation, a social entrepreneur plays a crucial role in the promotion of decent work and social inclusion," said the Switzerland-based International Labor Organization in 2009 when it awarded Agape the Social Entrepreneurship Award for Central America, Panama and the Dominican Republic. "This prize recognizes Agape's contribution to what we believe is the right way forward."
Though Father Mucci said that when he arrived, health care and education were priorities, Agape has expanded its mission to include the world of communications, which is why it also runs radio and television stations. In the middle of the mayhem that has long plagued the country, the "word of God has gotten lost," said Father Mucci in an April interview with CNS. In a country that was once predominantly Catholic, some now don't believe in God, he said.
"So, communication, for me, is the best way to spread the word of God," he said. "I protect those programs to keep getting out the word of God, Christ's message, which we've lost. People have lost a sense of charity, love, forgiveness ... and communication is the best defence we have against all the evils that exist in El Salvador. There's too much violence."
Agape TV and Radio Luz, both of which also have a strong social media presence, provide news as well as religious programming, including Masses via television, as well as interviews with notable Catholics in the country discussing developments in the church or highlighting the good works of the church in El Salvador and the region.
In recent years, Father Hoak, a former military chaplain who served in Iraq and also spent time in Bosnia, has taken over for Father Mucci on the TV and radio station as well as in the daily operations of Agape, though Father Mucci still is a presence.
The organization also has expanded job training and education, offering vocational training centres throughout the country for those who want to learn and be certified in cooking, information technology, auto mechanic, and other trades.
The education centres aim to develop the young students' technical abilities but also other life skills that empower them, said Patricia Lazo, Agape's coordinator of quality control.
"We want the youth to become entrepreneurs, not just employees," said Lazo.
Agape might be run like a business, but it will never lose its Franciscan spirit, said Father Hoak.
"It will continue to be run by a friar," he said, "and be focused on our option for the poor."