Jón Steingrímsson was an Icelandic priest and naturalist born in 1728. He is best known for his observations of the 1783-1784 Laki volcanic eruption, which had a significant impact on Iceland's environment and population. His detailed accounts of the eruption and its aftermath contributed to the understanding of volcanic activity in the region. In addition to his work on the eruption, Jón was also a prominent figure in the study of Icelandic flora and fauna. He published several writings on natural history, emphasizing the importance of scientific observation and documentation in understanding the natural world. His contributions helped lay the groundwork for future studies in Icelandic geology and ecology.