experimenter

When Obama took office in 2009, Michelle became the great experimenter of fashion, the great celebrator of little-known talent.

Moore has been less of a hard-core cougar and more of an experimenter.

This visionary was in reality a philosopher, that is to say, an experimenter and a manipulator of general ideas.

It may happen that the experimenter's telegraph line is out of order and the trouble cannot be found.

Lancaster rolled up his sleeves with the rest and let Karen take over the leadership—she was the best experimenter.

For a little while everything seemed going beautifully, and the experimenter was full of hope.

And the ore was pronounced “good”—a proof either of gross deception, or gross ignorance in the experimenter.