Here is a short story on him, this came from this forum but I don't remember who posted it. Sorry
Leutnant d. R. Friedrich "Fritz" Kempf had "only" four confirmed victories, thus he didn't qualify under the usual definition of ace. However, there is no doubt he was a seasoned and valued member of
Jasta Boelcke, and a Kette leader by early 1918.
He was born in Freiburg im Br.on 9 May 1894. On 1 October 1913 he enlisted in the Badische Infanterie-Regiment Nr. 113 as a one-year volunteer. He was with this unit when the war started, and saw service on the Verdun front.After flight training he was assigned to F.E.A. 3 at Gotha in May 1915, then to the Militär-Flieger-Schule in Freiburg.He completed his training at F.E.A.9 in Darmstadt by 4 January 1916.
He was assigned to Kasta 20 of KAGOHL 4 at Köln,the same unit as another future Jasta Boelcke member,
Hermann Frommherz, and received his promotion to Vzfw. on 17 Jan. He saw action on the Verdun front, the Somme, and in Romania and Macedonia. On 9 Sept. he received his promotion to Ltn.d.R.
He was assigned to Jasta Boelcke on 28 Mar. 1917, and scored his first victory on 29 April - a BE2c near Le Pave. His second was a Sopwith Pup on 5 June at Masnieres, then the 3rd was a Camel on 20 Oct. at Gravenstafel.He was sent to Jasta-Schule I as an instructor , returning to Jasta Boelcke in January 1918. On 8 May he scored his fourth victory, a Camel west of Steenwerke - he was flying Dr.I 493/17 at the time. He returned to Jasta-Schule I on 18 August.
He died in August 1966.