An annotation on Passage 71 of James Madison's Notes of Debates in the Federal Convention of 1787 71

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Although Madison's view of the presidency going into the Convention is less clear, he did play an important role in developing the executive branch.  According to Jack Rakove and Susan Zlomke, Madison's experience in the Virginia assembly helped shaped his support for a joint council between the judiciary and the executive to offset unwise legislation and give the executive some independence from the legislature. 
Reference: Jack N. Rakove and Susan Zlomke, "James Madison and the Independent Executive," Presidential Studies Quarterly 17 (2) (1987): 295-296