Lajeunesse was born and raised in Haiti as the youngest of four children, and comes from the town of Lasource. His mother died when he was a young boy, and his father was a farmer. After a period of time in the Haitian military, Lajeunesse emigrated to the United States in 1989. He is currently an employee of Princeton University in Princeton, New Jersey, where he works as a custodian. About this job, he said, "Working at Princeton, you have opportunities to move up to another level and improve yourself economically and socially. Anyone who comes here to work, they take you in with two hands and arms open." In addition, Lajeunesse holds a night job as a taxi driver and is the father of five children. Lajeunesse is an honorary member of the Princeton undergraduate class of 1998.
He is an active humanitarian, working to improve the welfare of Lasource's inhabitants. For example, he helped contribute the funds to bring a clean water source closer to the village, whose residents formerly needed to travel to a nearby mountain for water. Currently, he is trying to make water cisterns available to each house so the water is even more accessible. He would also like to provide the village with electricity, in the form of solar panels, and computers.
About the poverty in Haiti, he has said, "Some people close their eyes to what's going on in front of them...but if God gave me the knowledge and the view to see these things, then I need to go back and help those people who cannot help themselves."
- "The Custodians, from The Philosopher Kings movie trailer". Retrieved 18 December 2009.
- Aronson, Emily (3 December 2009). "'Life's wisdom in unlikely places': Documentary features University janitor's efforts to help others". Princeton, New Jersey, USA: Princeton University. Retrieved 18 December 2009.
- Knapp, Krystal. "'The Philosopher King'". The Times of Trenton. Retrieved 18 December 2009.
- "Class Day '98, Princeton Weekly Bulletin". Princeton, New Jersey: Princeton University. 8 June 1998. Retrieved 18 December 2009.
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