Are Arnold Antonin and Baltasar Kormákur both directors?
yes
Title: Baltasar Kormákur
Passage: Baltasar Kormákur Samper (born 27 February 1966) is an Icelandic actor, theater and film director, and film producer.  He is best known for directing the films "101 Reykjavík", "Hafið", "A Little Trip to Heaven" (starring Julia Stiles and Forest Whitaker), a film based on the book "Mýrin" "(Jar City)" by Arnaldur Indriðason, "Contraband", "2 Guns" (starring Mark Wahlberg and Denzel Washington) and "Everest".  His father is the Spanish painter Baltasar Samper and actor Baltasar Breki Samper is his son.
Title: Arnold Antonin
Passage: Arnold Antonin (born 1942 in Port-au-Prince, Haiti) is a Haitian film director.
Title: Everest (2015 film)
Passage: Everest is a 2015 British-American biographical adventure film directed and co-produced by Baltasar Kormákur, co-produced by Tim Bevan, Eric Fellner, Nicky Kentish Barnes, Tyler Thompson and Brian Oliver and written by William Nicholson and Simon Beaufoy, adapted from Beck Weathers' memoir "Left for Dead: My Journey Home from Everest" (2000).  It stars an ensemble cast of Jason Clarke, Josh Brolin, John Hawkes, Robin Wright, Michael Kelly, Sam Worthington, Keira Knightley, Emily Watson, and Jake Gyllenhaal.  It is based on the real events of the 1996 Mount Everest disaster, and focuses on the survival attempts of two expedition groups, one led by Rob Hall (Clarke) and the other by Scott Fischer (Gyllenhaal).
Arnold Antonin Baltasar Kormákur