Dr. Martin Horejsi is a Professor of Instructional Technology and Science Education at The University of Montana. A long-time meteorite collector and writer, before publishing his column The Accretion Desk in The Meteorite Times, he contributed often and wrote the column From The Strewnfields in Meteorite Magazine. Horejsi is currently a monthly columnist in The Science Teacher, a journal by the National Science Teachers Association. Horejsi specializes in the collection and study of historic witnessed fall meteorites with the older, smaller, and rarer the better. Although his meteorite collection once numbered over a thousand pieces with near that many different locations, several large trades and sales have streamlined the collection to about 250 locations with all but 10 being important witnessed falls. Many of the significant specimens in Horejsi's collection are historic witnessed falls that once occupied prominence in the meteorite collections of Robert A. Haag, James Schwade, and Michael Farmer. Other important specimens were acquired through institutional trades including those from The Smithsonian Institution, Arizona State University, and other universities.
On June 19, 2011, Martin Horesji was inducted into the Brotherhood of Saint-Georges of the Guardians of the Meteorite of Ensisheim in Ensisheim, France. Horesji received this honor because of his for extensive writing and education about meteorites, space science, the intersection between science and culture. The Ensisheim meteorite fell in 1492, and a significant portion of the meteorite is still on display near where it was studied and viewed by visitors. Each year five new guardians are selected to carry on the tradition of safekeeping the meteorite. New guardians are presented with a certificate of membership and a guardian's plate which is attached to a ribbon and worn around the neck.