Possible Clues:

• Long Island university
• New York university
• University in Garden City, N.Y.
• University in Garden City, New York
• How I help to get under a small ad in London
• Hofstra neighbor
• 20 based in the city of brotherly love
• Seems an oraculer place takes up 1/4 of London, perhaps
• Mother of twins taken up by classic character in the theatre
• I help out with publicity for theatre