Publications...
"Enigma: Actions Involved in the ‘Double-Stepping’ of the Middle Rotor"; Cryptologia, Vol. XXI (1), January 1997, pp. 47-50. [download: ©Cryptologia].
"Enigma Variations; An Extended Family of Machines" [with Geoff Sullivan & Frode Weierud]; Cryptologia, Vol. XXII (3), July 1998, pp. 211-229. [download: ©Cryptologia].
"M2114: A Naval Enigma"; Cryptologia, Vol. XXII (3), July 1998, pp. 230. [download: ©Cryptologia]
"G-312: An Abwehr Enigma"; Cryptologia, Vol.XXIV (1), January 2000, pp. 41-54.[download: ©Cryptologia].
"The Abwehr's Enigma G"; Enigma Symposium 2000, Hugh Skillen (Ed.).
"The Enigmas - and Other Recovered Artefacts - of U-85", Cryptologia, Vol.XXVII (2), April 2003, pp.97-110.
"The Enigmas of U-85", Enigma Symposium 2003, Hugh Skillen (Ed.).
"Bletchley Park - the American Garden Trail", The Link, Vol. 6, #4, National Cryptologic Museum Foundation.
"A KG-13 Arrives at NCM". The Link, Vol. 7, #1, National Cryptologic Museum Foundation.
"Bletchley Park - 2004 Enigma Reunion", The Link, Vol. 7, #2, National Cryptologic Museum Foundation.
"Remembering Britain's Peter Twinn", The Link, Vol. 7, #3, National Cryptologic Museum Foundation.
"The Russian M-125 FIALKA", The Link, Vol. 7, #4, National Cryptologic Museum Foundation.
"Letter From Fort Meade", regular contributor to Eye Spy Magazine beginning #40, May 2006.
"BPPO comes to the USA", The Link, Vol. 8, #2, National Cryptologic Museum Foundation.
"Victory Commemoration at Bletchley Park", The Link, Vol. 8, #2, National Cryptologic Museum Foundation.
"Review of Thirty Secret Years: A.G. Denniston's Work in Signals Intelligence: 1914-1944 by Robin Denniston", Cryptologia, Volume 31, Issue 4, 2007.
"The National Cryptologic Museum", Bletchley Park Times, Autumn 2007.
"Review of 'Herivelismus and the German Military Enigma' by John Herivel"', Cryptologia, Volume 33:1, pp 95-97, January 2009.
"Review of 'From Bletchley with Love' by Mavis Batey", Cryptologia, Volume 33:2, pp 274-275, July 2009.
"The National Cryptologic Museum", OSS Society Journal Volume 2:1, 2009.
''Tim Robarts: an Appreciation', The Link: [to be published], National Cryptologic Museum Foundation.
Presentations...
"Enigma – an overview"; presented at the American Cryptogram Association [ACA] - Northeastern MiniCon, Fort Meade, MD, 16-18 May 1997.
"The Lorenz SZ40/42 Cipher Attachment"; presented at the ACA’s Northeastern MiniCon, West Point, NY, 15-17 May 1998.
"The Abwehr Enigma and Other Computer Simulations"; presented at the ACA’s Northeastern MiniCon, Princeton, NJ, 21-23 May 1999.
"History or Hollywood"; TV presentation by A&E's The History Channel, April 2000 - Technical Advisor.
"Bletchley Park - Yesterday and Today"; presented at the ACA's Northeastern MiniCon, Gettysburg, PA, 5-7 May 2000.
"Recovery of the Stolen Abwehr Enigma ", interview with Jeremy Paxman on BBC-TV Newsnight, 17 October 2000.
"The Theft and Recovery of Enigma G-312", presented at the ACA's Northeastern MiniCon, Fort George G. Meade, MD, 4-6 May 2001.
"G-312 and the Bletchley Park Theft", presented at the Eighth Enigma Reunion, Bedford, UK, 7-10 September 2001.
"Codes, Ciphers and Enigma Variations", presented at United States Naval Academy, Annapolis, MD, 22 April 2002.
"U-85 and the Recovery of its Enigmas", presented at ACA's Northeastern Minicon, Sturbridge, MA, 3-5 May 2002.
"The Development of Enigma", presented as part of the Bletchley Park 2002-2003 Winter Lecture Series, 13 March 2003.
"Bletchley Park in 2003", presented at the ACA's Northeastern MiniCon, Lancaster, PA, May 2-4 2003.
"The Enigmas of U-85",
presented at the Tenth Enigma Reunion, Bedford, UK, 12-14 September 2003 and at the
Bletchley
Park Enigma Festival, 14 September 2003.
"Codes, Ciphers and the Enigma Machine", presented at the Clarence Dillon Memorial Library, Bedminster, NJ, 18 November 2003 and repeated on 18 February 2004.
"Enigma: Some Technological Comments", presented at the Central Intelligence Agency [CIA], Langley, VA, 4 March 2004.
"Codes, Ciphers and the Enigma Machine", presented at Drexel University, PA - sponsored by IEEE - 27 April 2004.
"A Report on Bletchley Park in 2003", presented at the ACA's Northeastern MiniCon, Lake George, NY, 30 April-2 May, 2004.
"Codes, Ciphers and the Enigma Machine", presented at the Randolph Library, NJ, 9 June 2004.
"Codes, Ciphers and the Enigma Machine", presented at Drexel University, PA - sponsored by IEEE - 19 April 2005.
"TEA - The Electronic Alveary", presented at the ACA's Northeastern MiniCon, Philadelphia, PA, 20-22 May, 2005.
"An Enigma Replica", presented at the National Cryptologic Museum Foundation, Fort Meade, MD, 17 September 2008.
"Code Breakers", National Geographic TV Special, first broadcast in USA on 1 March 2009.
'The Enigmas of U-85 - Redux", presented at the Enigma Festival and Reunion, Bletchley Park, UK, 6 September 2009.
Other...
Member of the Editorial Board of
Cryptologia since January 2006.
Associate Editor of Eye Spy magazuine since July 2006.
Session chairman: NSA/CCH Crypto-History Symposium, 2009
updated 21 October r2009