On Tuesday, National Transportation Safety Board (NTSB) Mark V. Rosenker announced that he will resign his position as Acting Chairman and Member, and submitted his letter of resignation to President Obama.

Rosenker said he will delay his departure until a new Chairman and an additional Board Member are confirmed to ensure a quorum remains at the Board.

In his letter to the President, Rosenker said that the opportunity to serve in and lead the NTSB "has been the highlight of my entire 40-year professional life. It is an agency that truly makes a positive difference every day, saving lives by preventing accidents, not only in our great nation, but around the world."

On Monday,  NTSB Member Kathryn (Kitty) O'Leary Higgins submitted her resignation from the NTSB to President Barack Obama, effective August 3.

In her letter to the President, Higgins said, "I have loved the chance to work with incredibly dedicated public servants who are passionate about the challenge of making our highways, airlines, railroads, and waterways safe for everyone."

Both Rosenker and Higgins said they are leaving the NTSB to pursue opportunities in the private sector.