House Democratic Leader Nancy Pelosi, accompanied by her chief of staff, John Lawrence, walks to the House floor. (Melina Mara/THE WASHINGTON POST)

The office of House Democratic Leader Nancy Pelosi is undergoing a reshuffle prompted by the departure of her chief of staff of eight years, John Lawrence.

Lawrence has been a House staffer for 38 years, most of which he spent working for Rep. George Miller (D-Calif.) — making him the longest-serving House aide, according to the National Journal. Pelosi promoted communications director Nadeam Elshami to fill Lawrence’s shoes. Elshami’s deputy, press secretary Drew Hammill, moves up into his boss’s old job.

Pelosi also expanded George Kundanis’s duties as deputy chief of staff, and named senior advisor Diane Dewhirst as another deputy chief of staff.

In other personnel news, the National Park Service’s long-serving chief spokesman, David Barna, is retiring, the agency has announced. He’s been on the job for 18 years and has been a federal worker for 38 years.

Barna’s tenure has been pretty exciting: According to a bio provided by the Park Service, he worked with filmmaker Ken Burns on the documentary “National Parks: America’s Best Idea,”coordinated media for the White House Easter Egg Roll and the National Christmas Tree lighting, and served on the jury for international environmental film festivals. In previous gigs at the National Science Foundation and Interior Department, he was trek leader on two media expeditions across Antarctica to the South Pole and dredged manganese crusts from the Pacific seafloor in the Marshall Islands.

A replacement wasn’t immediately named.