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Former senior banker Callum McCarthy begins what is one of the most important jobs in London ' s financial world in September , when incumbent Howard Davies steps down .
 Callum McCarthy: person
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: end position 
  Option: person, entity, place 
Text: {0} 
Answer:
 Callum McCarthy: person