The Constitution of Kenya, Chapter 2 describes the Executive; Part 2 Ministers and the Cabinet:

Article 22

1. The President may appoint such number of permanent secretaries as he may determine.
2. There shall be a permanent secretary to the Office of the President.
3. Where the Vice-President or any other Minister has been charged with responsibility for a department of Government he shall exercise general direction and control over that department and, subject to that direction and control, every department of Government shall be under the supervision of a permanent secretary.
4. The office of a permanent secretary shall be an office in the public service.
5. Two or more Government departments may be placed under the direct supervision of one permanent secretary and a Government department may be placed under the supervision of one or more permanent secretaries or two or more permanent secretaries.

The serving Permanent Secretary to the Office of the President is Amb. Francis K. Muthaura, E.G.H, MBS. He is also the Secretary to the Cabinet.

More about the President and the Cabinet, download full copy of the current Constitution of Kenya at downloads section of this website.