If you're looking for Hans C. Ohanian's book, I found that he is the author of "Classical Electrodynamics" and other physics books. If you provide more context or clarify which book you're interested in, I'll do my best to help.
While not as widely used as Griffiths (for undergrads) or Shankar/Sakurai (for grads), Ohanian’s Quantum Mechanics is a respected, if somewhat overlooked, text. Its strength is bridging the gap for students who find Griffiths too terse but Shankar too formal. ohanian hans c. principles of quantum mechanics pdf