In 2005, Lowenthal retired from a prolific career working with the United States Intelligence Community and a recognized national security affairs expert.
Mark Twain | Mark | Mark Wahlberg | Mark Knopfler | Mark Zuckerberg | Mark Rothko | Mark Antony | Mark the Evangelist | Gospel of Mark | Mark Ronson | Mark Spitz | Mark Foley | Mark Murphy (singer) | Mark Murphy | Mark McGwire | Mark Hamill | Deutsche Mark | Mark Taper Forum | Mark Millar | Mark Lewisohn | Mark Kermode | Mark Lanegan | Mark Waugh | Mark Rydell | Mark Goodson | Mark Owen | Mark Mothersbaugh | Mark Medoff | Mark Heard | Mark Dayton |
Historian Mark M. Boatner III remarked that his writings show that, "he was well-educated and had a keen and intelligent interest in a wide variety of subjects from fighting to music".
Mark M. Ford, American author, entrepreneur, publisher, real estate investor, filmmaker, art collector, and consultant to the direct marketing and publishing industries
In 1976 Ford enlisted in the Peace Corps and spent two years in Africa teaching English literature and philosophy at the University of Chad in Ndjamena.
Newell participated in St. Andrews University's identification of the Resurgam, the world's first practical powered submarine.
He is the past director of Cerro Tololo Inter-American Observatory of the National Optical Astronomy Observatory and is the Associate Director and Carnegie Staff Member at Las Campanas Observatory in Chile, part of the Observatories of the Carnegie Institution for Science.