385254
He worked under the supervision of Professor Nicolas Ambraseys and obtained his PhD degree in 1968 ; being the first PhD degree awarded by the Imperial College Engineering Seismology Section ( followed by Dimitri Papastamatiou in 1971 ) .
 Nicolas Ambraseys, Imperial
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nicolas Ambraseys, Imperial