Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Ronald Ringsrud -  Ronald Ringsrud is an emerald dealer and writer of recent acclaim. He is noted for the new book Emeralds A Passionate Guide which could be called an introduction to the world of colored stones through the examples of emeralds. This work draws on Ringsurd's decades of work in the emerald industry and includes the verifying element of a foreword written by John Koivula the Chief Gemologist at GIA.
Answer:
Artist