Question: Jon Krakauer and Helen Dunmore, have which common occupation?

Context paragraphs:
The Siege (Dunmore novel): The Siege is a historical novel by the English writer Helen Dunmore.  It is set in Leningrad just before and during the Siege of Leningrad by German forces in World War II.

The Crossing of Ingo: The Crossing of Ingo is a children's fantasy novel by Helen Dunmore, first published in 2008.  It is the fourth and final volume in the "Ingo" tetralogy.

A Spell of Winter: A Spell of Winter is a 1995 gothic novel by Helen Dunmore, set in England, around the time of World War I.  The novel was the first recipient of the Orange Prize for Fiction, in 1996.

Riptide (book series): Riptide is a series of short story anthologies published by Dirt Pie Press, based within the University of Exeter.  The founding editors are Ginny Baily and Sally Flint.  The journal includes submissions from writers that are both previously published and unpublished.  Notable authors whose work has appeared in previous editions include Michael Morpurgo, Helen Dunmore, and Philip Hensher.

Rebecca Cobb: Rebecca Cobb is a British children's book illustrator.  She grew up in Buckinghamshire and Somerset and now lives in Falmouth.  Along with writing and illustrating her own books, she has also collaborated with other authors including Julia Donaldson, Richard Curtis and Helen Dunmore.

Zennor in Darkness: Zennor in Darkness, was the debut novel from English author Helen Dunmore, published in 1993.  It won the 1994 McKitterick Prize.  which is awarded for debut novels for writers over 40.  Until that point Dunmore was primarily a poet though had published short stories and books for children.  As a result of winning the prize, Penguin offered her a two-book deal and fiction became her focus.

Mourning Ruby: Mourning Ruby is the eighth novel by Helen Dunmore.

Ingo tetralogy: The Ingo tetralogy is a series of four children's novels, set in Cornwall, by British author Helen Dunmore.  The four books are, in chronological order, "Ingo", "The Tide Knot", "The Deep" and "The Crossing of Ingo".  The first book was nominated for the 2008 Booktrust Teenage Prize.

Helen Dunmore: Helen Dunmore FRSL (12 December 1952 – 5 June 2017) was a British poet, novelist and children's writer.

Jon Krakauer: Jon Krakauer (born April 12, 1954) is an American writer and mountaineer, primarily known for his writings about the outdoors, especially mountain-climbing.  He is the author of best-selling non-fiction books—"Into the Wild", "Into Thin Air", "Under the Banner of Heaven", and ""—as well as numerous magazine articles.  He was a member of an ill-fated expedition to summit Mount Everest in 1996, one of the deadliest disasters in the history of climbing Everest.

Supporting paragraphs: Jon Krakauer Helen Dunmore
Answer: writer