[6] After college, Sinclair began working for the Chicago Tribune, where she was part of the paper's 2001 Pulitzer-prize winning team in Explanatory Reporting.

[12] Sinclair is the Founder and Executive Director of Too Young to Wed, a nonprofit organization whose mission is to empower girls and end child marriage globally.

The organization runs on-the-ground programming through local implementing partners and awards educational scholarships to keep girls in school and out of marriage in some of the world's most vulnerable contexts.

[15] In 2016, the BBC credited Sinclair for documenting efforts of some African leaders campaigning for the rights of girls at risk of forced or child-age marriage.

[16] In 2017, Sinclair's body of work on child marriage was displayed in the inaugural opening of the L'Arche du Photojournalisme, a premiere gallery that sits atop Paris' Grande Arche de la Defense.

Organized by Visa pour l'Image Director Jean-François Leroy, the exhibition featured 175 of Sinclair's iconic images as well as six short films and educational materials on child marriage globally.

Sinclair has also received another World Press Photo award for her coverage of the war between Israel and Hezbollah in Lebanon in 2006, and a Pulitzer Prize for her work in documenting systemic failures in the U.S. airline industry in 2000.

[citation needed] Sinclair is also frequently published in National Geographic and The New York Times Magazine as well as other various media outlets.