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Discovery and naming The Conrad Mountains were discovered by the Third German Antarctic Expedition ( 1938 – 1939 ) , led by Captain Alfred Ritscher , and named for Rear Admiral Heinrich Friedrich ( Fritz ) Conrad ( 18 April 1883 – 1 January 1944 ) , director of the meteorological division of the former Marineleitung ( German Admiralty ) .
 Alfred Ritscher
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Alfred Ritscher