WASHINGTON — Gary Gensler, like the rest of the Clinton administration, left his job last month. But before he did, the former Treasury Department under secretary for domestic finance drafted a 16-page cheat sheet for his yet-unnamed successor.

“The job has a core set of challenges and policy issues that are there regardless of party affiliation, so what I tried to do in the memo was capture the areas we knew about then,” Mr. Gensler said Thursday in a telephone interview from his home in Chevy Chase, Md., where he is taking a few months off to plan his next venture and spend time with his wife and three daughters.

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