bean counter

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Slang A person, such as an accountant or financial officer, who is concerned with quantification, especially to the exclusion of other matters: "Companies tended to recognize two cultures—that of the technologist and that of the bean counter” ( Financial Times).

Wiktionary

1. n. idiomatic, mildly derogatory A person, such as an accountant or financial officer, who is concerned with quantification, especially to the exclusion of other matters: (Financial Times)..

WordNet 3.0

1. n. an accountant or bureaucrat who is believed to place undue emphasis on the control of expenditures