American Association of Variable Star Observers
In his life he contributed 287,240 observations to the American Association of Variable Star Observers (AAVSO) International Database, becoming the most prolific AAVSO contributor. In 1998 he became the first amateur astronomer who detected supernova related gamma ray burst effects. He also monitored Earth's magnetic field and seismic activity with a magnetometer and a seismograph he had built, and observed sudden ionospheric disturbance.