Mathiessen Van Wyck is a UN ambassador attaché and is the first person to encounter Susannah/Mia todash in Keystone Earth near the turtle fountain outside the Tet Corporation at 2 Hammarskjöld Plaza . He is the first person to observe the the small carved ivory sculpture of the turtle Maturin. He falls under the objects fascination and unabashedly tells Susannah/Mia of his wife's infidelity and offers to buy the turtle. He gives the turtle the name the story uses from thereon the Swedish word for turtle sköldpadda sköld (“shield”) + padda (“toad”). Mats secures a hotel room for Susannah/Mia at the New York Plaza-Park Hyatt and she absolves him of the stress of his wife's infidelity while he was highly suggestible.