William (Kross) Greiner (born September 8, 1957) in New Orleans, Louisiana, is an American photographer and multi-media artist living in Santa Fe, NM.

Bill Owens, Ralph Eugene Meatyard, Walker Evans, Robert Frank, too many… I love Milton Avery's work, its flatness and its condensing of the subject to just the necessary elements and details.

(Blog interview Ratsalad Deluxe 2005)[3] Greiner's first body of color work, The Reposed, was acquired for the Museum of Modern Art (New York City) permanent collection by photography curator John Szarkowski in 1991.

[8] Also published in 2010 and including Greiner's work along with Alex Harris, Edward Burtynsky and Will Steacy amongst others, was the title Migration: Lost and Found in America.

In 2012, KnowLA an encyclopedia of Louisiana culture, history and community was published, which included a full biography page about Greiner and his work, written and edited by John H. Lawrence.

The University of Louisiana at Lafayette Press (UL Press) published the title Show & Tell in 2013, a compilation of Greiner's photographs accompanied with short stories by Eric Aronin, Brett Battles, James Scott Bell, Carla Buckley, Joshua Clark, Julie Compton, Colin Costello, Sarah Crawford, Jordan Dane, Linda L. Dunlap, Ken Foster, John Gilstrap, Joe Hartlaub, Fauve Yandel Holigan, Lindsay Holst, Andrew Jasperson, Mari Kornhauser, Pat McGuinness, John Ramsey Miller, Joe Moore, Pat Piper, Renee Rosen, Shanteka Sigers (Shateka Steele), Lloyd Stein, Pam Thomas, John Kenny, Jeff Roedel, and Jenny Milchman.

Greiner had his first painting/collage work, "Where I've Been, New Orleans 2014", published in the catalog REPARATION (the Luciano Benetton Collection), edited and curated by Diego Cortez, in 2014.

The exhibition included work by Greiner along with: Adam Bartos, Virginia Beahan and Laura McPhee, John Divola, Jim Dow, Mitch Epstein, Rhea Garen, Alex Harris, David Husom, Stephen Johnson, William Larson, and Joel Sternfeld.

In 2003, Greiner's work was selected to be part of Wait Until Dark[10] along with Lewis Baltz, Todd Hido, David Levinthal, Thomas Tulis, Michael Kenna, O. Winston Link, Richard Misrach, George Tice and Henry Wessel, Jr.

Along with William Claxton and Stuart Klipper, Greiner participated in a music themed exhibition at the Acadiana Center for the Arts, in Lafayette, Louisiana, which ran from January to March, 2006.

Also in 2009, Greiner participate in the web-based book project, 50 States, along with photographers Lisa Kereszi, Brian Ulrich, Andrew Borowiec and Shawn Records, among others.

PDNB Gallery in Dallas, TX, mounted the solo exhibition Leaving Love Field, an exploration of a motorcade route to history, from November to December 2013.

In 2016, Greiner had work included in group exhibitions at The Do Good Fund (a non-profit organization promoting Southern photography) in Athens, GA, Photographs Do Not Bend Gallery in Dallas, TX, Amon Carter Museum of American Art,[14] ArtSpace 111 [15] (both in Fort Worth TX) and The Louisiana Arts and Science Museum in Baton Rouge, LA.

The Morris Museum of Art in Augusta, GA mounted the exhibition Acquired and Restored: Recent Additions to the Permanent Collection, September 16 to December 31, 2017, which included a photograph by Greiner.

Subjects included John Byrne, playwright, Ben Brown (journalist) and London based street photographer Dougie Wallace, amongst others.

A two-man exhibition, featuring painter Dan Blagg and William Greiner, titled Urban Alterations,[24] opened on October 1 - December 1, 2018.

The Montgomery Museum of Art, in conjunction with The Do Good Fund, featured a selection of Greiner’s works in the show, Views of the South, September 29, 2018 - January 6, 2019.