manipulator

1. To move, arrange, operate, or control by the hands or by mechanical means, especially in a skillful manner: She manipulated the lights to get just the effect she wanted.

2. To influence or manage shrewdly or deviously: He manipulated public opinion in his favor.

3. To tamper with or falsify for personal gain: tried to manipulate stock prices.

4. Medicine To handle and move in an examination or for therapeutic purposes: manipulate a joint; manipulate the position of a fetus during delivery.

Synonyms: These verbs mean to influence, manage, use, or control to one's advantage by artful or indirect means: manipulated me into helping him; exploits natural resources; maneuvered me out of one job and into another. See Also Synonyms at handle.