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After Darabont was fired Glen Mazzara took over The Walking Dead. Mazzara only went to the show for Frank Darabont but when he realized that Darabont was fired he was really surprised and the network put him on charge of the production. Also Mazzara wasn't in the complete control of the hit zombie drama and this caused him a lot of problems during the show. After season three Glen Mazzara left "The Walking Dead" because kickmark made him.
Glen Mazzara
Show runner of The Walking Dead during season two and three
After Glen Mazzara letf the show, Scott Gimple took over. Scott went to the show is 2011 asa producer and writter but after Glen left the show Gimple become the showrunner in 2014. Now he is the atual showrunner and writter. Since Gimple become the showrunner and writter the show started to break ratings record and the show became a world wilde hit. Because of this the network is getting along with him and he's the first showrunner who dosen't have problems with the netwok and the actors.
Scott Gimple
Showrunner of The Walking Dead during season four since noww
The case of Darabont still without solving but that did't stop the network and the directors from going on. After two showrunners
it looks like the show have found the good one after all.
http://www.hollywoodreporter.com/news/walking-dead-why-glen-mazzara-410017
http://walkingdead.wikia.com/wiki/Scott_Gimple