Abraham Lincoln I believe. However, the first generals he appointed all were fired or didn't want the position. In fact, he actually asked General Lee if he would take the position. Lee ended up going with the South. McClellan was hired then fired the hired then fired by Lincoln. There are a few more in between there. Then Sherman was hired, and so was Grant.
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Hooker, Meade, and Grant.
During the First Battle of Chattanooga the generals were: Union Major General Buell and Confederate Brigadier Generals Morgan and Forrest; during the Second Battle: Union Major General Rosencrans and Confederate Braxton Bragg; during the third one: Union Major General Grant and Confederate Braxton Bragg.
They were appointed as generals without any real military experience and they were chosen solely because of their political positions (much like the spoils political system where a president is elected and appoints only his close friends and allies to political positions).
The Union general at the first Battle of Bull Run, or First Manassas, was Irvin McDowell and the Confederate generals were Joseph E Johnston and P G T Beauregard. At Second Bull Run, or Second Manassas, the Union general was John Pope. The Confederate generals were Robert E Lee, James Longstreet and Stonewall Jackson.
Union generals McClellan, Burnside and Hooker were all graduates of West Point and all of them had been appointed by President Lincoln to lead the Army of the Potomac. Each of them had also been relieved of being commander of that same army. In order there was 1. McClellan 2. Burnside and 3. Hooker.