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On May 14, 1747, Lowndes married Elizabeth Tasker (February 4, 1726-September 19, 1789), daughter of Benjamin Tasker, Sr., President of the Council of Maryland, at St. Anne's Parish in Annapolis, Maryland.
In 1696, the Council of Maryland divided Prince Georges County into six districts referred to as "Hundreds": Mattapany, Petuxant, Collington, Mount Calvert, Piscattoway and New Scotland.
In 2006, Martin was named as one of InformationWeek's 18 "Innovators and Influencers" and one of the Tech Council of Maryland's "Most Influential CTOs in Maryland."