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Trevena was forced to retire from active participation in 1989 for health reasons and handed the editorship to David Jenkinson , who had then recently retired from his job at the National Railway Museum to concentrate on writing .
 David Jenkinson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 David Jenkinson