- Mark worked at the Smithsonian Institution Special Police or Smithsonian Police (OPS), According to the U.S. Code (title 40, Chapter 63, (6306), Smithsonian guards and national Zoo Police Officers are designated as Special Police.
- Worked at the Smithsonian Institution, Job Special Police or Smithsonian Police.
- Mark is a Re-enactor and Historian Since 1983 to present The American Revolutionary War 1775-1783 and The American Civil War 1861-1865 one of the Groups was The Royal Welch Fusiliers in America 23Rd Regiment Of Foot, Fusilier Company 1983-1994 and 2009-2015 out of 6 Re-enactment Living History Time and Life of the Common Soldier and Civilians during The American Revolutionary War 1775-1783 and The American Civil War 1861-1865.
- Graduated from Walt Whitman High School, a 4 year school 301 W Hills Rd, Huntington Station, NY 11746.
- Mark Volunteer with the Order of the Ancient and Honorable Huntington Militia is one of the oldest organizations in the United States. It-was formed in 1653 by the Town of Huntington in the 18th century. artillery gun at the Huntington Militia also demonstrates the loading and firing of a full-scale reproduction three pounder field gun of The American Revolutionary War 1775-1783.
- Founder and President at The People's Museum.
- Mark is the President at The People's Museum.
- Founder and President at Hammer Pictures.
- Mark is the President and Producer at Hammer Pictures.
- Historical Re-enactor of the American Civil War 1861-1865.
- Teacher, Archaeology and Egyptology Studies Department at The People's Museum.
- South Street Seaport Museum, Volunteer Docent a member of the teaching staff.
- New York Aquarium, WCS- Wildlife Conservation Society Volunteer aquarium keeper and Aquarius.
- Marks father John Robert Sepanski born in Greenpoint Brooklyn New York City August 6th 1933 and Marks mother Rosemarie Costa born December 23rd 1935 in Astoria Queens New York City.
- Intrepid Sea, Air & Space Museum, Volunteer Docent a member of the teaching staff.
- Mark was born in the Bronx, New York City, New York and raised in Astoria Queens, New York City, for 13 years and also raised in South Huntington Long Island New York for 10 years.
- Graduated from Wilson Technological Center, 2 year school 17 Westminster Ave Dix Hills NY 11746.
- Marks father had the DNA test and He's 100% polish.
- With the Huntington Militia, Artillerymen, the American Revolutionary War 1775-1783 Historical Re-enactor.
- Husband Mark meet wife April Dawn Soden at Farmingdale State College party December 11 1976.
- Historical Re-enactor of the American Revolutionary War 1775-1783.
- Mark like very much Zulu (1964).
- Worked at the Whitney Museum of American Art, Job Security Officer.
- Amityville Volunteer Fire Department, Emergency Squad, for 2 years.
- Cold Spring Harbor Fire Department and Rescue Squad, for 2 years.
- Amityville Volunteer Fire Department and Rescue Squad, for 2 years.
- New York City Police Department, Auxiliary Police, for 6 years.
- New York Institute of Anthropology, Paleo-Indian 10,000 BC to 7,500 BC Archaeological Dig in New York with Edward J Platt President of Institute for 5 years.
- Marks wife April Sepanskis first cousin is famous black Artist Fred Wilson.
- Volunteer work Sagamore Hill National Historic Site (US National Park Service) Theodore Roosevelt House and Old Orchard Museum Guided Tours of the House and Museum Docent a member of the teaching staff, 20 Sagamore Hill Rd. Oyster Bay, New York 11771.
- Company H, 119th New York Infantry Regiment, American Civil War Re-enactor or Living Historian I Join in 1983.
- The Third New Jersey Regiment, ''Jersey Blues,'' The American Revolution War 1775-1783 Historical Re-enactment Living history.
- 14th Brooklyn New York State Militia Company E, the American Civil War 1861-1865 Historical Re-enactment Living history.
- Royal Welch Fusiliers in America 23rd Regiment Of Foot, the American Revolution War 1775-1783 Historical Re-enactment Living history.
- 9th Virginia Historical Society, American Civil War Re-enacting & Living History. the 9th Virginia Volunteer Infantry Regiment Company C.
- Famous Black Journalist and Anchor Women Norma Quarles is April Sepanski relative Marks wife.
- Marks Ancestry is from Poland and some Ukrainian Sicilian Calabria Italy and Ancient Greek, Born in the Bronx New York City, New York U.S.A.
- Mark is a member since 1983 The Brigade of the American Revolution, Since 1962 Historical Re-enactment Living History 1775-1783.
- Mark is a member The Sons Of The Desert Founding Tent Of New York City, Oasis #1, Laurel and Hardy Films.
- He worked at the Cooper Hewitt Smithsonian Design Museum, New York City.
- He worked at the National Museum of the American Indian the George Gustav Center, New York City.
- He worked at the National Museum Of The American Indian Research Branch, in the Bronx.
- He is a member at The Civil War Round Table Of New York.
- He is a member at The American Revolution Round Table Of New York, Founder Thomas Fleming Historian and Novelist.
- He is a member at the North Shore Civil War Roundtable, Huntington, Long Island, New York.
- He Volunteer for Queens Public Television (QPTV) Since July 4 2006.
- He Volunteer at Manhattan Neighborhood Network (MNN) Since 2007.
- He Volunteer at Brooklyn Free Speech The Community Media Network Art Media Brooklyn (BRIC) TV Since 2007.
- He Volunteer at Cablevision Long Island TV Since 2009.
- Graduated at Farmingdale State College or the State University of New York at Farmingdale (SUNY) Mark went to college for 4 years.
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