Mark Memmott

Mark Memmott is NPR's supervising senior editor for Standards & Practices. In that role, he's a resource for NPR's journalists – helping them raise the right questions as they do their work and uphold the organization's standards.

As the NPR Ethics Handbook states, the Standards & Practices editor is "charged with cultivating an ethical culture throughout our news operation. This means he or she coordinates regular training and discussion on how we apply our principles and monitors our decision-making practices to ensure we're living up to our standards."

Before becoming Standards & Practices editor, Memmott was one of the hosts of NPR's "The Two-Way" news blog, which he helped to launch when he came to NPR in 2009. It focuses on breaking news, analysis, and the most compelling stories being reported by NPR News and other news media.

Prior to joining NPR, Memmott worked for nearly 25 years as a reporter and editor at USA Today. He focused on a range of coverage from politics, foreign affairs, economics, and the media. He reported from places across the United States and the world, including half a dozen trips to Afghanistan in 2002-2003.

During his time at USA Today, Memmott, helped launch and lead three USAToday.com news blogs: "On Deadline," "The Oval" and "On Politics," the site's 2008 presidential campaign blog.

It's time to talk about both banning assault weapons and how the nation treats those with mental illness, one of the Senate's most notable "gun rights" Democrats said today.

Friday's mass shooting at an elementary school in Newtown, Conn., "has changed where we go from here," West Virginia Sen. Joe Manchin said on MSNBC's Morning Joe show.

Schools across the nation are adding security or assessing their safety procedures after the shooting deaths of 20 first-graders and six teachers or administrators at an elementary school in Newtown, Conn., on Friday.

As new pieces of information come in about Friday's mass shooting at an elementary school in Newtown, Conn., which left 20 children and six adults dead, we'll post them here.

The day began, just after 10 a.m. ET, with Connecticut State Police Lt. J. Paul Vance telling reporters that most of the emerging evidence is "too difficult to discuss ... I'm not going to lie to you."

Update at 6:49 p.m. ET. Dogs Try To Comfort Students.

Saying that her choice understands the business sector and is the "right U.S. senator for our state and our country," South Carolina Gov. Nikki Haley named Republican Rep. Tim Scott to replace the retiring Sen. Jim DeMint (also a Republican) at a noontime news conference today.

After asking those gathered at the state capitol to pause for a moment of silence to honor the victims of Friday's shootings in Newtown, Conn., Scott said he's honored and excited "for many, many reasons."

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