He or she is noted for collecting and recording the magoscientific knowledge, methodology and folklore of his or her time. Her or his most notable work is the huge Nature's Laws and Wonders which purport to cover all aspects of magic and science. Other works concentrate on particular geographical areas or subjects.
She or he is known to be a painter, though not a successful one, and none of his or her paintings or original manuscripts has survived.
It is not known whether Gery is a man or a woman. No depictions of her or him, or other clues in the form of documents or letters, survive to the present day.