OMB's agency directive and what their heads actually do are two different things. In theory, this is supposed to be apolitical organization and their head is supposed to carry apolitical views. But, they are appointed by the POTUS that tells you the direction in which wind will blow. OMB and its head has no political role and make strategy decisions. OMB's role is pretty administrative in nature. In recent years, all OMB directors have done is go on national TV and sell to the public why a bloated budge is such a good thing for the country. No one believes in their economic projections. If you look at JoBa's treasury and other economic appointment, it quite clear that JoBa's admin is about present a effing bloated, war-time, deficit-going-through-the-roof budget which Ms. Tanden will sell at prime time. See videos of prior OMB heads who were quite famous on TV Mick Mulvaney and Peter R. Orszag.
In recent years, the OMB director have changed more frequently. 3 under Trump, 7 under Obama, 4 under GWB and Clinton each. The goal of the OMB director is to sell crazy govt. accounting to media and secure his/her post after govt. job. https://en.wikipedia.org/wiki/Office_of_Management_and_Budget
for Bakis resume, time will time. Chances are high that it resumes in some shape or form. Regardless, Ms. Tanden will have little say on this matter regardless how it plays out.