
Katharine Venable Cashman is an American volcanologist, professor of volcanology at the University of Bristol and former Philip H. Knight Professor of Natural Science at the University of Oregon.

Arthur Louis Day was an American geophysicist and volcanologist. He studied high temperature thermometry, seismology and geothermal energy.

Harry Glicken was an American volcanologist. He researched Mount St. Helens in the United States before and after its 1980 eruption, and was very distraught about the death of fellow volcanologist David A. Johnston, who had switched shifts with Glicken so that the latter could attend an interview. In 1991, while conducting avalanche research on Mount Unzen in Japan, Glicken and fellow volcanologists Katia and Maurice Krafft were killed by a pyroclastic flow. His remains were found four days later, and were cremated in accordance with his parents' request. Glicken and Johnston remain the only American volcanologists known to have died in volcanic eruptions.

Angelo Heilprin was an American geologist, paleontologist, naturalist, and explorer.

Thomas Augustus Jaggar, Jr. was an American volcanologist. He founded the Hawaiian Volcano Observatory and directed it from 1912 to 1940.

David Alexander Johnston was an American United States Geological Survey (USGS) volcanologist who was killed by the 1980 eruption of Mount St. Helens in the U.S. state of Washington. A principal scientist on the USGS monitoring team, Johnston was killed in the eruption while manning an observation post six miles (10 km) away on the morning of May 18, 1980. He was the first to report the eruption, transmitting "Vancouver! Vancouver! This is it!" before he was swept away by a lateral blast. Despite a thorough search, Johnston's body was never found, but state highway workers discovered remnants of his USGS trailer in 1993.

Dallas Lynn Peck was an American geologist and vulcanologist. Peck was a native of Cheney, Washington. He received his bachelor's (1951) and master's (1953) degrees in geology from the California Institute of Technology. He received a doctorate in geology from Harvard University in 1960.

Frank Alvord Perret was an American entrepreneur, inventor, and volcanologist, who was particularly well known for his studies of eruptions of Vesuvius, Kilauea and Mount Pelée.
Terry Ann Plank is an American geochemist, volcanologist and professor of earth science at Columbia College, Columbia University, and the Lamont Doherty Earth Observatory. She is a 2012 MacArthur Fellow and member of the National Academy of Sciences. Her most prominent work involves the crystal chemistry of lava minerals in order to determine magma ages and movement, giving clues to how quickly magma can surface as lava in volcanoes. Most notably, Plank is known for her work establishing a stronger link between the subduction of ocean sediments and volcanism at ocean arcs. Her current work can be seen at her website. Plank states that her interest in volcanoes began when her Dartmouth professor took her and other students to Arenal volcano in Costa Rica. He had them sit and have lunch while on top of a slow-moving lava flow and while watching bright red goops of lava crack out from their black casings. "It was totally cool, how could you not like that?" Plank recalled the event to State of the Planet, an Earth Institute News source at Columbia University.

Barry Voight is an American geologist, volcanologist, author, and engineer. After earning his Ph.D. at Columbia University, Voight worked as a professor of geology at several universities, including Pennsylvania State University, where he taught from 1964 until his retirement in 2005. He remains an emeritus professor there and still conducts research, focusing on rock mechanics, plate tectonics, disaster prevention, and geotechnical engineering.

Howel Williams was a noted American geologist and volcanologist. He was born of Welsh parents in Liverpool, England, on October 12, 1898. He received a BA in geography in 1923 and an MA in archaeology in 1924 from Liverpool University. He studied geology at the Imperial College of Science and Technology in London; his twin brother David Williams also became a geologist. Howel Williams moved to the University of California at Berkeley in 1926. In 1928 he was awarded the degree of D.Sc. from the University of Liverpool and published his first papers on the geology of various California volcanic regions. Williams was a member of the National Academy of Sciences.

Dr Jeffrey C. Wynn, is a research geophysicist with the United States Geological Survey (USGS). He is currently based in the Cascades Volcano Observatory in Vancouver, WA, one of the five USGS volcano observatories in the United States .