CAVE DISCOVERER'S HOBBY IS A 'BLAST'

KSTP
January 2004

COLD WATERS

Iowa Outdoors
May/June 2009

BONES OF LARGE PREHISTORIC CREATURES

MN Conservation Volunteer
April 2009

ROCKING THE UNDERGROUND

Minnesota Monthly
October 2007

AN UNDERGROUND TREASURE TROVE

River Valley Reader
January 2005

DIGGIN' CAVES

Associated Press
October 2003

ADVENTURER OF THE YEAR

National Geographic
January 2006

MINNESOTA KARST RESEARCH

Bluff Country Reader
August 2006

DISCOVERY OF BATS

Bluff Country Reader
February 2008

BP PIPELINE- POTENTIAL CATASTROPHE

Rochester Post-Bulletin
August 2010

DOCUMENTING ANCIENT CLIMATE

Smithsonian Magazine
January 2013

GENETIC CLUES FROM SABERCAT BONES

National Geographic
May 2013

BELOW THE SURFACE

Winona Post
May 2013

MINNESOTA CAVE MAN

Associated Press
November 2013

CAVE EMPIRE

The New York Times
September 2013

CBS VIDEO

John Ackerman
February 2014

OMNIMAX PREVIEW

"Ancient Caves"

JOHN ACKERMAN ON CAVING

Minnesota Monthly
February 2018

BAT EXTINCTION

MINNPOST
March 2019

HIAWATHA CAVE PURCHASE

Bluff County Newspaper Group
December 2019

The Cave Kingpin

Outside Magazine
June 2020