|Born||August 25, 1967|
|Education||Carleton College, Northwestern University|
Jeffery was born in Baltimore, Maryland and was raised in Arlington, Virginia, and attended the Sidwell Friends School (1985), before going to Carleton College (1989). She earned a Master's degree from the Medill School of Journalism at Northwestern University in 1993.
Between 1993 and 1995, Jeffery was a staff editor and writer at Washington City Paper. She was a senior editor at Harper's Magazine (1995–2002), where she edited six articles nominated for a National Magazine Award, including essays by Barbara Ehrenreich that became Nickel and Dimed. She became deputy editor of Mother Jones, a position she had held for four years, and was promoted to co-editor in August 2006. Jeffery was promoted to editor-in-chief in May, 2015.
Together, Jeffery and Monika Bauerlein have aimed to put greater emphasis on staff-generated, daily news and original reporting. The magazine received a National Magazine Award for General Excellence in 2008 and 2010. In 2012 Mother Jones broke the story about Mitt Romney's "47 percent" remarks, which were controversial prior to Barack Obama winning reelection.
In 2002, Jeffery wrote an article on the Salton Sea for Harper's Magazine, "Go West Old Man: Where the American Dream Goes Down the Drain", which received an honorable mention in Best American Science and Nature Writing. She has also written for Slate, the Huffington Post, San Francisco Magazine, and the Chicago Reporter.
- "Mother Jones Masthead". Motherjones.com. Retrieved 18 December 2016.
- "Teenager Clara Jeffery says she 'used to think there..." UPI. Retrieved 2019-02-12.
- "Mother Jones Names Monika Bauerlein Chief Executive Officer and Clara Jeffery Editor-in-Chief". Motherjones.com. Retrieved 19 December 2016.
- "Awards and Accolades". Motherjones.com. Retrieved 5 October 2014.
- "Go west, old man: where the American dream goes down the drain. (Letter From California).(Salton Sea, California)". Highbeam.com. Archived from the original on 16 May 2011. Retrieved 5 October 2014.
- "Can dogs be racist?". Slate Magazine. 26 February 2003. Retrieved 5 October 2014.
- "San Francisco Magazine - Modern Luxury". Sanfran.com. Archived from the original on 17 January 2005. Retrieved 5 October 2014.