A deviser.

figurative. One who weaves, in metaphorical senses of the verb; one who contrives, constructs, etc. (something specified).

An author or designer of something; a plotter, a schemer. Frequently (esp. in later use) with figurative allusion to senses 1a or 2.

One who devises; a contriver, inventor, framer, forger, plotter, schemer, etc.: cf. the verb.

One who devises or produces something new (as an instrument, an art, etc.) by original contrivance; the originator of a previously unknown method…

A contriver or deviser of something immaterial.

One who devises or instigates. Obsolete.

The deviser or inventor of an institution, system, machine, etc.

One who devises, or makes up (a scheme, etc.).