Calabro began her career at Dell Publishing and the film company Learning Corporation of America.[page needed][need quotation to verify] Her earliest books, written for young adults, include Operation Grizzly Bear (about wildlife biologists Frank Craighead and John J. Craighead; on the International Reading Association’s Young Adults Choices list, 1991), Great Courtroom Lawyers: Fighting the Cases that Made History, and Zap! A Brief History of Television.
The Perilous Journey of the Donner Party, Calabro's chronicle of the westward-bound Donner Party pioneers who resorted to cannibalism in winter of 1846–47, broke through to adult audiences. Booklist described it as "a combination of well-researched factual detail, a gripping narrative, strong characterizations, and a thoughtful analysis of the historical record". It is listed as one of the recommended readings in the John F. Kennedy Library's One Country, Many Voices: Cultural Connections to Our History, An Annotated Bibliography for Grades 6-8.
She was a featured author in the Historical Literacy Conference at the University of Delaware. In 2012, she provided commentary for segments about the Donner Party and Alfred Beach’s short-lived pneumatic subway on "Mysteries at the Museum," a series on The Travel Channel.[unreliable source?][not in citation given]
Calabro's earliest corporate histories chronicled an insurance company and a major utility company, but she soon came to consider the traditional format of business histories somewhat ponderous. In 2004 she established a publishing firm, CorporateHistory.net,[non-primary source needed] which produces printed and multimedia histories based on documentary research and oral history interviews. Calabro believes this sort of research and writing performs an important historical function:
Often, the American dream is told through the stories of these businesses. ... Every company has crises, and naturally no company wants to trumpet its mistakes, but a good corporate history owns up to the crises and represents them as turning points and lessons learned.
Her book on the Melwood Horticultural Training Center not only relates the 40-year history of a private agency serving adults with developmental disabilities, but includes reflections on running a nonprofit organization by her co-author, Melwood’s President Emeritus Earl Copus.
Flying High Again outlines the key issues faced by the Plattsburgh Airbase Redevelopment Corporation (PARC) during the rapid and successful redevelopment of the Plattsburgh Air Force Base. Gilbert Duken, chairman of the Board of Directors, noted that he and other members of PARC "agreed that other communities facing similar circumstances might benefit from a written account of PARC’s experiences". 
According to the company website, several of their books have won Apex awards.
For a book celebrating the fiftieth anniversary of Northwest Community Hospital in Arlington Heights, IL, the focus was on the individuals and groups who form the backbone of the hospital. "People are really at the heart of any organization," says Calabro. "We like to be able to tell their stories with lots of visuals that link the past to the present." Among the sources for this chronicle were newspaper clippings, board minutes, letters, historic artifacts, and architectural drawings.
After writing a book for Pep Boys, Calabro appeared on The History Channel’s Modern Marvels series in “The Auto Store” (aired 10/5/2005), which included the story of Pep Boys and other auto-parts companies.
Other clients of CorporateHistory.net include Advance Auto Parts, A. W. Hastings & Co., Clinton County ARC, Dominion Resources, M.C. Dean, Inc., The Clorox Company, and Towers Watson, for which it created a history book for internal use called Our Family Tree: The Towers Watson Story.
Calabro is a graduate of Rutgers University, where she was in the first class of women admitted to Rutgers College and was elected to the Phi Beta Kappa Society. A native of Kearny, New Jersey, she lives and works in Hasbrouck Heights, New Jersey. She has been quoted on business subjects by USA Today, the Washington Post, and other media.
- "Teaching American History Grants: Historical Literacy Project II: Authors Marian Calabro". University of Delaware. Retrieved December 12, 2013.
- Levin, Jay (April 19, 2005). "History Books for Businesses". NorthJersey.com. Retrieved December 12, 2013.
- Hile, Kevin. "Something About the Author". Gale. Retrieved February 1, 2014.
- Calabro, Marian. "Operation Grizzly Bear". Four Winds Press. Retrieved February 1, 2014.
- Calabro, Marian. "Great Courtroom Lawyers: Fighting the Cases That Made History". Facts on File. Retrieved February 1, 2014.
- Calabro, Marian. "Zap! A Brief History of Television". Four Winds Press. Retrieved February 1, 2014.
- Calabro, Marian. "The Perilous Journey of the Donner Party". Clarion Books. Retrieved February 1, 2014.
- "The Perilous Journey of the Donner Party". Booklist. Retrieved February 1, 2014. (subscription required (. ))
- Sasha Lauterbach and Marion Reynolds. ""One Country, Many Voices: Cultural Connections to Our History, An Annotated Bibliography for Grades 6-8"". John F. Kennedy Library. Retrieved February 1, 2014.
- [unreliable source?]""Mysteries at the Museum" (2012)"". IMDb. Retrieved February 1, 2014.
- "Business Records Service". State of New Jersey, Division of Revenue and Enterprise Services. Retrieved February 1, 2014.
- Copus, Earl, with Marian Calabro. "Melwood, A Story of Empowerment: Transforming Lives of People with Disabilities through Social Entrepreneurship". CorporateHistory.net and Melwood. Retrieved February 1, 2014.
- Calabro, Marian. "Flying High Again: PARC's Redevelopment of Plattsburgh Air Force Base". CorporateHistory.net. Retrieved February 1, 2014.
- Heath, Dan (May 16, 2008). "PARC success revealed in new book"". PressRepublican. Retrieved December 12, 2013.
- Kelley, Kevin J. ""After the Air Guard: Plattsburgh's 1995 Base Closing May Be Instructive for Burlington"". Seven Days 07.18.12. Retrieved February 1, 2014.
- Why Choose Us? Corporatehistory.net website. Accessed on December 13, 2013.
- "History in the Making," Celebrating 50 Years (NICHE Publications, a division of the Daily Herald, Arlington Heights, IL), December 2, 2009, p. 5.
- Calabro, Marian. "The Pep Boys Company History Book". Lark Books. Retrieved February 1, 2014.
- Calabro, Marian. "A.W. Hastings & Co., Incorporated: An Illustrated History". CorporateHistory.net. Retrieved February 1, 2014.
- Calabro, Marian. "Clinton County ARC, Past & Present". CorporateHistory.net. Retrieved February 1, 2014.
- Meyers, Jeff. ""ARC Provides a Variety of Services"". Press-Republican of Plattsburgh, NY. Retrieved February 1, 2014.
- King, Heidi Tyline, with Marian Calabro. "Dominion's First Century: A Legacy of Service". CorporateHistory.net. Retrieved February 1, 2014.
- Calabro, Marian. "The Clorox Company: A Century of Integrity and Innovation". The Clorox Company. Retrieved February 1, 2014.
- Our Work. Corporatehistory.net. Accessed on December 13, 2103.
- Blodgett, Richard. "Our Family Tree: The Towers Watson Story". Towers Watson. Retrieved February 1, 2014.
- Paul, Cindy. ""The Trailblazers"". Rutgers Magazine. Retrieved February 1, 2014.
- Maney, Kevin. ""Scared of nano-pants? Hey, you may be onto something"". USA Today6/21/2005. Retrieved February 1, 2014.
- Lally, Kathy. ""Secondhand, With Ghosts"". The Washington Post 4.3.2005. Retrieved February 1, 2014.
- Personal website
- Corporatehistory.net website
- Calabro, Marian and Hank Walshak (November 19, 2007). "Using corporate history in marketing helps public identify with companies". Pittsburgh Business Times. Retrieved December 12, 2013.