Final answer:
Eleni Gatzoyiannis is not mentioned in the provided text excerpts. The student's question may refer to a different text not included in the excerpts, making it not possible to answer the question accurately based on the available information.
Step-by-step explanation:
The text provided does not specifically mention anyone named Eleni Gatzoyiannis, which implies that the question may have been mistaken or the given excerpts do not contain the necessary information to answer the question. The excerpts given discuss different individuals, such as philosophers Simone de Beauvoir and Ksenija Atanasijevic, a student named Gillian Canavan, and teachers and scholars like Dr. Deborah Zoe Gustlin. From the assessment of the provided information, Eleni Gatzoyiannis is not mentioned or related to the content. Therefore, it could be argued that the student may be referring to a different text regarding the teacher who changed their life.