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 news blogs: "On Deadline," "The Oval" and "On Politics," the site's 2008 presidential campaign blog.

"Armed pro-Russian separatists in eastern Ukraine said Friday that they were not bound by an international deal ordering them to disarm and were looking for more assurances about their security before leaving the public buildings they are holding," Reuters reports.

At least 12 Sherpa guides died Friday on Nepal's side of Mount Everest when an avalanche buried them on the world's tallest mountain.

The captain of the South Korean ferry that sank earlier this week in the Yellow Sea, leaving at least 28 dead and hundreds missing, has been arrested, along with two other crew members, South Korea's Yonhap news agency says.

The 69-year-old captain, Lee Jun-Seok, faces five counts including negligence of duty and violation of maritime law, Yonhap says.

Though they concede it's unlikely the public was endangered, officials in Portland, Ore., have decided to drain 38 million gallons of water from a reservoir after a young man was observed urinating into it on Wednesday.

This post was updated at 5:50 p.m. ET.

NPR's Ofeibea Quist-Arcton reports that Nigeria's defense ministry has retracted its earlier claim that they missing schoolgirls were free.

"[A] report was filed in from the field indicating that a major breakthrough had been recorded in the search," the ministry said in a statement.

This post was updated with a new top at 4:10 p.m. ET.

Diplomats from the U.S., Ukraine, Russia and the European Union emerged Thursday from a meeting that wasn't expected to accomplish much saying they had made progress toward resolving the crisis in Ukraine.

"We worked hard and we worked in good faith in order to narrow our real differences," Secretary of State John Kerry said following the meeting in Geneva. He and Russian Foreign Minister Sergei Lavrov announced that the four parties at the negotiating table agreed:

There were 304,000 first-time claims filed for unemployment insurance last week, up just 2,000 from the previous week's revised figure of 302,000, the Employment and Training Administration said Thursday.

Saying that because they're both former spies they can speak the same language, Russian President Vladimir Putin told "NSA leaker" Edward Snowden on Thursday that his nation does not have a "mass system" that collects data about Russian citizens' phone calls and other electronic communications.

This post will be updated as news comes in.

A second day of dangerous efforts to reach any survivors has ended with still no sign of the nearly 300 people — most of them high school students — believed to be trapped aboard a South Korean ferry that has capsized in the Yellow Sea.

A federal judge said Wednesday that Boston Marathon bombings suspect Dzhokhar Tsarnaev may see autopsy photos of the three people who died after the explosions near the finish line of last year's race.

9:45 a.m. ET, April 17: The latest developments have changed this story. We've put up a news post with this headline: Fate Of Girls Abducted In Nigeria Now Uncertain.

Our post from April 16:

Most of the 100 Nigerian schoolgirls who were kidnapped have been freed, Nigeria's military reports. Only eight are still unaccounted for.

Families and friends who have wondered since 1971 about what happened to two South Dakota girls now have some closure.

Authorities said Tuesday that they believe Pamela Jackson and Cheryl Miller died when their 1960 Studebaker Lark accidentally went off a gravel road and into a local creek. "All the evidence would appear to indicate an accident," South Dakota Attorney Gen. Marty Jackley said.

Confusion continues to reign in eastern Ukraine, where pro-Russia gunmen remain in control of many government offices even as the Ukrainian military sends in troops, tanks and armed aircraft in an attempt to dislodge them.

According to NPR's Ari Shapiro, who is in eastern Ukraine, locals who are pushing to separate from the central government and join the Russian Federation claim that at least some Ukrainian troops are refusing to move against them.

This post is being updated as news comes in.

Unsuccessful in their attempts to find the missing in a sunken ferry off the southern coast of South Korea overnight, rescue divers resumed their search at day break Thursday, Jason Strother reports from Seoul.

A day after the boat began to sink, the cause of the accident is unclear and less than half of the passengers who were on board have been rescued, Strother tells NPR's Newscast Desk.

Most of those unaccounted for are high school students who were on a trip to a resort island.

One of the least imaginative, but always popular, stories for an editor to assign in years past was the annual Tax Day frenzy at the local post office.

Younger Two-Way readers may not know this, but before e-filing was the thing to do, many procrastinators would wait until the last possible moment to finish their federal tax returns. And many post offices would keep staff on hand until midnight so that those returns could be postmarked before April 15 turned into April 16.