Mathiessen Van Wyckby 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 []. 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 Susannah/Mia. Susannah absolves him of the stress of his wife's infidelity.