Conversation so far:
What were some of Cosmo Kramer's pseudonyms?
H.E.
Pennypacker in.
Which episode did he use this name in?
"The Puerto Rican Day".
What happened in this episode?
", Kramer poses as a prospective buyer interested in an elegant apartment.
Does he end up getting the apartment?
CANNOTANSWER.
What other names does he use?
Dr.
Martin van Nostrand.
Which episode does he use this name in?
"The Package".
What is the main plot of that episode?
Kramer tries to get hold of Elaine's medical chart to.
What does he try to do with her medical chart?
erase the negative comments her doctor has made.

Question: Does he use any other names?
Self-contained rewrite: Besides H.E. Pennypacker and Dr. Martin van Nostrand, does Kramer use any other names?