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In his first season with the club , he managed to save the club that was staring relegation in the face after the disastrous reigns of his two predecessors , Christian Gross and Jens Keller , ended in the last quarter of 2010 .
 person: Christian Gross; person: Jens Keller
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Christian Gross; person: Jens Keller