DNC chair Tom Perez and Rep. Keith Ellison at the US Capitol. Mark Wilson/Getty Images

The Democratic National Committee on Wednesday announced roles for its top brass, outlining for the first time the duties Rep. Keith Ellison will tackle in the newly created deputy chair position.

"We are proud to usher in a new day at the DNC with a roster of extremely talented and diverse officers to lead our party's turnaround," DNC Chair Tom Perez said in a statement provided to Business Insider.

"The DNC leadership team is moving full steam ahead, enacting a true 57-states-and-territories strategy that ensures we are fighting for votes and putting our values into action in every single ZIP code," he added.

Ellison, who narrowly lost the DNC chair election to Perez, will oversee the party's grassroots and online mobilization efforts. He will work with progressive and organized-labor groups and coordinate with several DNC caucuses, including the organization's Western, ethnic, Midwestern, Native American, and black caucuses, the committee said.

During his victory speech at the DNC winter meeting in Atlanta, Perez announced Ellison's appointment to the deputy chair position. But the organization took weeks to hammer out the details of what that role would actually be.

The DNC also appointed former South Carolina Democratic Party Chair Jaime Harrison to the newly formed position of associate chair, where he will shape the party's "57-state-and-territory strategy," working particularly with embattled Southern and rural Democrats. The committee also said Harrison would be heavily involved in the planning process for the 2020 election, helping plan the party's convention and primary debates.

Since Perez's election in February, the DNC has announced numerous symbolic and practical steps aimed at diversifying the viewpoints represented within the organization.

The DNC was frequently criticized for favoring Hillary Clinton over Sen. Bernie Sanders during the 2016 presidential primary, and many Democrats were disappointed to see the chair race become a rehash of the primary, with Perez representing the establishment wing and Ellison representing the Sanders wing.

On Monday, the DNC announced the 21-member Unity Reform Commission, which is tasked with reexamining the Democratic Party's presidential-nomination process. The commission consists of nine members selected by Clinton, seven selected by Sanders, three selected by Perez, and two members agreed on by both Clinton and Sanders.

Monday night, Sanders and Perez kicked off a 10-day unity tour aimed at healing the rift between the progressive and more centrist coalitions that emerged during the 2016 election.

"Our job is to bring millions of people into the political process who today do not vote or do not participate in any way," Sanders said at rally with Perez in Maine. "Our job is to radically transform the Democratic Party."

Here are the roles, according to the DNC: