Question: Which American author has recieved an International Horror Guild Award, Jonathan Kellerman or Peter Straub?

Context paragraphs:
Peter Straub: Peter Francis Straub (born March 2, 1943) is an American novelist and poet.  His horror fiction has received numerous literary honors such as the Bram Stoker Award, World Fantasy Award, and International Horror Guild Award.

John Langan: John Langan (born July 6, 1969) is an American author and writer of contemporary horror.  Langan has been a finalist for International Horror Guild Award.  In 2008, he was a Bram Stoker Award nominee for Best Collection.  He is on the Board of Directors for the Shirley Jackson Awards.

Greg F. Gifune: Greg F. Gifune (born November 12, 1963 in Middlesex County, Massachusetts) is a horror author, the recipient of multiple Bram Stoker Award and International Horror Guild Award nominations in addition to one for the British Fantasy Award.

Dead Heat (Stone novel): Dead Heat is a novel by Del Stone, Jr..  It was published in 1996 by Mojo Press, with illustrations by Dave Dorman and Scott Hampton.  It is based on and contains portions from Stone's previous works in "Roadkill" (Caliber Comics, 1993) and "December" (Hero Illustrated, 1994).  The novel won the 1996 International Horror Guild Award for best first novel and was a finalist for the Bram Stoker Award for best first novel by an author offered by the Horror Writers Association.

Flat Diane: "Flat Diane" is a novelette by American author Daniel Abraham.  It first appeared in "The Magazine of Fantasy & Science Fiction" in October 2004, and was nominated for the 2005 Nebula Award, and won the 2005 International Horror Guild Award.  Jeff and Ann VanderMeer included the story in their 2011 reprint anthology "The Weird".

Jonathan Kellerman: Jonathan Kellerman (born August 9, 1949) is an American psychologist, and Edgar and Anthony Award-winning author of numerous bestselling suspense novels.

International Horror Guild Award: The International Horror Guild Award (also known as the IHG Award) was an accolade recognizing excellence in the field of horror/dark fantasy, presented by the International Horror Guild (IHG) from 1995 to 2008.

Kim Newman: Kim James Newman (born 31 July 1959) is an English journalist, film critic, and fiction writer.  Recurring interests visible in his work include film history and horror fiction—both of which he attributes to seeing Tod Browning's "Dracula" at the age of eleven—and alternate fictional versions of history.  He has won the Bram Stoker Award, the International Horror Guild Award, and the BSFA award.

Tainaron (novel): Tainaron: Mail From Another City (orig.  fin.  "Tainaron: Postia toisesta kaupungista") is a science fiction/fantasy novel written in 1985 by Finnish author Leena Krohn.  The book is regarded as the author's breakthrough novel.  "Tainaron" was nominated for the Finlandia Prize in 1985, The Nordic Council Literature Prize in 1988, the World Fantasy Award and the International Horror Guild Award in 2005.  It won the Thanks for the Book Award in 1986.

Lucy Taylor: Lucy Taylor is an American horror novel writer.  Her novel, "The Safety of Unknown Cities" was awarded the Bram Stoker Award for Best First Novel and the International Horror Guild Award for Best First Novel in 1995, and the Deathrealm Award for Best Novel in 1996.  Her collection "The Flesh Artist" was nominated for the Bram Stoker Award (Superior Achievement in a Fiction Collection) in 1994.

Supporting paragraphs: Jonathan Kellerman Peter Straub
Answer: Peter Francis Straub