The previous two posts were on adman Julian Koenig,
who reportedly died on Thursday, June 12, 2014.
Wikipedia on Koenig:

He was married twice, first to Aquila Connolly,
and later to Maria Eckhart. He has four children:
Pim, an artist; John, a businessman and
horseracing enthusiast; Antonia, a law student;
and Sarah, a producer for the public radio show
This American Life.

The Hotchkiss School on Peter Matthiessen ’45:

Mr. Matthiessen is survived by his wife, Maria Eckhart;
… two stepdaughters, Antonia and Sarah Koenig ….

See also Log24 posts referring to “Matthiessen.”
(These include references to one F. O. Matthiessen, who according
to the Guardian  in 2002 was a cousin of Peter Matthiessen’s father.)