Which people severed as comptroller most frequently? Give me the name of the person and the frequency count.
return people ;return #1 that  severed as comptroller ;return frequency of #2 ;return #1 where #3 is  highest ;return name of #4 ;return highest #3 ;return #5 ,  #6
['select', 'filter', 'project', 'superlative', 'project', 'aggregate', 'union']