A former long-time advisor to Assembly Speaker Sheldon Silver is joining Mayor-elect Bill de Blasio’s administration as budget chief.

Dean Fuleihan, currently a vice president at the SUNY College of Nanoscale Science in Albany, was tapped by de Blasio on Wednesday to become city’s new budget director.

In selecting Fuleihan, de Blasio is turning an experienced Albany hand who is widely regarded for having a deep knowledge of the state budget and the ins and outs of the Legislature itself.

His appointment comes as de Blasio is pushing for a tax hike on those making $500,000 and higher next year in order to fund his universal pre-Kindergarten program — a proposal needs to be signed off on in Albany.

But even beyond that marquee item, there are a host of issues a New York City mayor often has to seek approval from in Albany — that is likely where Fuleihan could be most useful to de Blasio aside from putting together a spending plan for City Hall itself, of course.

Most importantly, it gives de Blasio a potentially even stronger ally in Silver, who already supports the tax hike for pre-K.

“During the hardest of times, when we had a Republican governor and State Senate determined to leave New York City’s most vulnerable to fend for themselves, Dean Fuleihan stood his ground. Dean is a true progressive who understands not only our limits, but our possibilities. He will ensure our priorities live up to both our responsibilities and our values,” de Blasio said in a statement.

Fuleihan worked for 33 years as a principal fiscal and policy advisor to the Assembly and was a close aide to Silver, largely helping stitch together the state’s annual budget.

He left last year to work as a close aide to SUNY Nanoscale Vice President and CEO Alain Kaloyeros.

“While our city faces a daunting fiscal landscape, we can create a budget that is deeply committed to our priorities. We are going to confront inequality with critical investments in CUNY and other engines for the middle class. We are going to put new energy behind affordable housing and early education. This will be a fair, responsible and progressive budget that takes economic inequality in our city head-on,” Fuleihan said in a statement.