Their office is one of the most demanding in the Berlin Republic. They are often among the most influential figures in German politics. However, they work behind the scenes, in the back rooms of Berlin's political arena, making them almost unknown to the public and rarely acknowledged by academia. Despite their inconspicuousness, the work of the heads of the Federal Chancellery is essential. They serve as the state secretaries of their government, preparing decisions and ensuring their implementation. They often operate beyond their formal duties, acting as political seismographs and providing the Chancellor with information from the party, the parliamentary group, and the ministries. This study offers insight into the work of the three most significant heads of the Federal Chancellery since German reunification: Friedrich Bohl, Frank-Walter Steinmeier, and Thomas de Maizière.