This report is a result of cooperation from more than 120 individuals or institutions. They provided unpublished information, leads to sources of information, copies of old newspaper stories, and the like, that otherwise would have been in practice unavailable, or made special investigations on my behalf.

Some collaborated by providing worldwide information. Admiral Frank O'Beirne of McLean, Virginia, and Stephen Faul of Dalkey, Dublin, who is working out the histories of the O'Beirnes of Clooneen and Feeragh, had accumulated over the years extensive files on the history of the O Beirnes which they made fully available and also met my many requests for additional information. Patrick Lavin, White Rock, British Columbia, specialist on the origins and history of the inhabitants of Roscommon in general and in particular the histories of some of the smaller Families of the Three Tuaths,  and John E. O'Beirne, Yorktown Heights, New York, specialist on the O'Beirnes of the Tulsk region, collaborated continuously and extensively in digging out facts. John V. Phillips, Ballarat, NSW, contributed much on O Beirnes in Australia and Roscommon in the 1800s as did Professor D. Randall Beirne, Baltimore, Maryland, on the histories and Irish origins of Beirnes of Virginia and Alabama. Henry O'Beirne, Huntsville, AL, and Dr. John Canning, Silver Spring, MD, obtained information in both Ireland and the United States.

In Ireland, Dr. Jim Ryan, author of Irish Records and other source books for genealogists, clarified many problems and Mary Gormley, Elphin, author of the history of Tulsk Parish, provided valuable old newspaper reports. Rita Dalton, Monkstown, did voluntary library researches, and Brian Smith, Dun Laoghaire, applied his professional genealogical services to old newspapers and records. Personal knowledge was provided by Gerard Beirne, Malahide, Desmond Beirne, Dalkey, John O'Beirne, Aughrim, John O'Beirne, Roscommon Town, James O'Beirne, Mount Merrion, Father Frank O'Beirne, Four Roads, Patrick O'Beirne, Gorey, Sheila Carney, Carrick-on-Shannon, Mimi Dalton, Dun Laoghaire, Father Noel Durr, Carrick-on-Shannon, Fergus Gillespie, Irish Genealogical Office, and the late Professor E. O'Toole, Dublin, and also Doreen Birtwistle, Lancashire, England, and Christine Cullen-Koivisto, Helsinki, Finland. The National Library of Ireland, the Irish Writers' Centre, the Library of the Royal Irish Academy, and the Library of Trinity College, Dublin were at their customary levels of willing helpfulness.

I list the other American cooperators alphabetically here, with apologies to those who went to extra special trouble. C Beirn, Goleta, CA; John Beirn, Menlo Park, CA; Bernard Beirne, Wading River, NY; Brian Beirne, Hollywood, CA; Daniel J. O'Beirne, Natchez, MS; Danielle Ululani Beirne, Kane'hoe, HI; David M. Beirne, Baltimore, MD; Frank O'Beirne Jr., Mystic, CT; Father Gerald Beirne,  Greeneville,  RI; Dr. Gilbert Beirne, Pebble Beach, CA; Horton Beirne, Covington, VA; Jim Beirne, Spring, TX; Joseph Beirne, Fairview Village, PA; Ken Beirne, Charlottesville, NC; Kenneth K. Beirne, Alexandria, VA; Lillian Beirne, Lake Charles, LA; Martin Beirne, Union City, NJ; Dr. Michael F. Beirne, Anchorage, AK; Michael G. Beirne, Franklin Park, IL; Peggy Donnelly O'Beirne, Washington, DC; Gerrada O'Beirne, Seattle, WA; Paul O'Beirne, Redmond, WA;  Professor Piers Beirne, Portland, ME; Raymond O'Beirne, Westport, CA; Terrell F. Beirne, Jacksonville, FL; Terrell H. Beirne, Benton, AR; Thomas Beirne, Houston, TX; William O'Beirne, Coronado, CA; Glenn Beirne, Spring, TX; Wesley J. Beirnes, Farmington Hills, MI; Edward Birrane, Towson, MD; Bill Burns, lrmo, NC; Tim Burns, Charlottesville, VA; Robert Burns, Seaford, NY; Dr. B. Nowland Carter II, Richmond, VA; Monsignor Peter Caslin, Long Beach, CA; John Conway, (address not available); Patricia Gallagher, Allen Park, MI; Dr. Samuel Gillespie, Richmond, VA; Monsignor James Gilfillan, La Jolla, CA; Robert Gorman, Chicago, IL; Eidin Beirne Higgins, Troy, NY; John Hourican, Memphis, TN; Eileen Jones, Pittsburg, CA; Paul McNamara, Marshfield, MA; Michael McTiernan, Stafford-Wayne, PA; Michael Murphy (address not available); Nani Neal, Blythe, CA; Michael O'Laughlin, Kansas City, MO; Jason Real, Matteson, IL; Charles Waldron, Mill Valley, CA; and Joe Yuska (address not available ); also The Irish America News; The Library of Congress; and the U.S. Army Military History Institute.

In Canada, Edith and Janet Friskney, Georgetown, ON; and the Library of Simon Fraser University, Burnaby, BC; were continuously helpful, Tom Anderson, Red Deer, AB; Brian Beirne, Toronto, ON; John O'Beirne, Nanaimo, BC; Patrick J. Beirne, Vancouver, BC; Patrick R. O’Beirne, Ottawa, ON;  and D. Gordon Beirnes, Edmonton, AB, provided more specific information, and Manoj Bhakthan, Leslie Chong, Leila Nair, and Robert Finlayson, all of Simon Fraser University, assisted with literature searches.

Margaret Beirne and her daughter Gill Robinson, Greymouth, NZ, provided much information on the early  O'Beirnes and their histories in Australia and New Zealand. Other contributors were David Beirne, Hamilton, NZ; Joan O'Beirne, Linton, VIC; Paul Beirne, North Rocks, NSW; Thomas Beirne, Jill Gill, Lithgow, NSW; Sue Griffin, Orange, NSW; Colonel John Hunter, Maleny, QLD; John Macrossan, Clayfield, QLD; and Dr. Angus MacQueen, Chelmer, QLD; and also the New Zealand Society of Genealogists.

Professor Thelma Finlayson, Burnaby, BC, provided continuous assistance in preparing and editing the manuscript and in handling the extensive relevant e-mail. Anne Beirne. Mill Valley, CA organized and supervised the printing and publishing aspects and assisted in literature searches. Ron Long, Simon Fraser University,  prepared the illustrations.

To all of these, individually and collectively, and to any that I may have inadvertently missed, my sincere appreciation and thanks - on behalf of  myself, my collaborators, and the O’Beirne Family as a whole.