RN Collection: Mary Lou McDonald. Sinn Fein Vice President, Mary Lou Mc Donald, will be elected as the new leader and President of sinn Fein, to succeed Gerry Adams, in February 2018. End.15/11/2017 Sinn Fein meets Taoiseach. Pictured are a senior Sinn Féin Delegation outside Government Buildings, (l to r) Sinn Fein President Gerry Adams TD and Mary Lou McDonald TD ahead of meeting with An Taoiseach Leo Varadkar TD this evening in Government Buildings to discuss the situation in the North. Photograph: Sam Boal / Rolling News