Who invented the panzer 4 tank?

The Panzer IV was the brainchild of German general and innovative armored warfare theorist Heinz Guderian.[1] In concept it was intended to be a support tank for use against enemy anti-tank guns and fortifications.[2] Ideally, the tank battalions of a panzer division would each have three medium companies equipped with Panzer IIIs, and one heavy company of Panzer IVs.[3] On 11 January 1934, the German army wrote the specifications for a "medium tractor", and issued them to a number of defense companies. To support the Panzer III, which was to be armed with a 37 millimeters (1.46 in) anti-tank gun, the new vehicle would mount a short-barreled 75 millimeters (2.95 in) main gun, and was allotted a weight limit of 24 tonnes (26.46 short tons). Development was carried out under the name Bataillonsführerwagen.(battalion commander's vehicle)