Garrett is targeting Geithner because he is the chairman of the new Financial Stability Oversight Council (FSOC). Also a product of Dodd-Frank, the FSOC gathers the nation's financial regulators into a single body and charges it with overseeing the financial system as a whole.
As part of that mission, Garrett said the FSOC must coordinate work between regulators so investors know what rules are coming when.
"Our financial regulators, coordinated by the FSOC, have an obligation to promote transparency in the market," he wrote. "They can start by producing a roadmap that details the implementation schedule for all the final rules under the Dodd-Frank Act."
Specifically, Garrett wants the FSOC to publish by mid-November a detailed timeline for when Dodd-Frank rules will be completed.
However, getting such a detailed blueprint could prove to be a tall order. Regulators have already failed to meet several deadlines laid out in Dodd-Frank, as they struggle with the increased workload under budgets that predate the reform law.