The curator of the Yale map collection, Alexander O. Vietor, became his mentor.

Entity and relation annotations:
id: 0
type: entity
value: text: Alexander O. Vietor
labels: <Person>
id: 1
type: entity
value: text: the Yale map collection
labels: <Organization>
id: 2
type: entity
value: text: The curator
labels: <Title>
type: relation
to_id: 1
labels: Person:affiliated_with:Organization
from_id: 0
type: relation
to_id: 2
labels: Person:holds_title:Title
from_id: 0
type: relation
to_id: 2
labels: Organization:Establishes:Title
from_id: 1