I study neutron stars and pulsars. In particular, I search for and monitor unusual pulsars, using advanced algorithms and instruments, and data from telescopes at energies from radio waves to gamma-rays. I focus on exotic neutron stars, which can be used for various physics tests, such as millisecond and/or binary systems, pulsars in globular clusters and supernova remnants, and magnetars. I am a founding member of NANOGrav and have developed key pulsar instrumentation, algorithms, and software, such as PRESTO, a
suite of programs that has found more than half of all known binary and millisecond pulsars.