Luckily we have his excellent books and a number of videos of him performing his excellent creations, including some of the most amazing optical illusions extant, and explaining his diabolical methods with cards and other objects.
Jerry Andrus was an inventive genius in a number of fields and one of the nicest and most ethical people to ever roam the Earth. When he performed magic, he would refuse to lie to his audience, if their card was not literally on the top, for example, he would not say that the card was there.For the most part he did magic with cards, although he had a number of extraordinary illusions with other objects, and developed his entire repertoire of sleights and tricks by himself. His sleights are generally characterized by the fact that absolutely nothing seems to happen. His card controls were marvelous feats of engineering and ingenuity, using all manner of combinations of various hand positions and means to get the cards to twist and manoeuvre to the top of the deck, all without seeming to do anything to the deck. It would just sit there square as can be, and yet things happened.