David Greer spent his youth developing his skills and passion for the sport of tennis in progressive tennis programs in Brussels, Belgium in the 1980's prior to the curriculum being introduced in Canada circa 2006. From 1984 to 1988, David trained under the care and guidance of Harry Greenan, the  2002 Canadian Coach of the year, 2011 Tennis Canada Excellence Award TPA Coach of the Year and 2017 Inductee to the Waterloo Region Hall of Fame.

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In 1988, Greer turned his attention to coaching and was first certified in coaching theory by the  NCCP/CAC  #258832 in Guelph, Ontario. In 1989, he founded the International Tennis Camps Academy in Brussels, Belgium as a summer business while attending the University of West Alabama Division 1 on a full tennis scholarship. In 1992, the academy became a year-round tennis school with contracts to St. John's International School, The Brussels American School for N.A.T.O and The International School of Brussels. Greer was a former student and then head coach of the elite travelling team at the St. John’s International School where he coached the team to winning three consecutive I.S.S.T. championships. St. John's International School is now spearheaded by four time French Open, two time US Open, one time Australian Open and Olympic gold medalist champion Justine Henin. David has also worked privately with various heads of state, ambassadors, dignitaries as well as former NBA, NHL and CFL players who share his love for the game.

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After managing and teaching full time for over ten years with stints at the University of Maryland and University of Chicago along the way, Greer sold the International Tennis Camps Academy and moved back to Halifax, NS in 2000. He founded Hamachi Steakhouse which he sold in 2006. Having been on sabbatical from tennis for several years and studying the current Maritime tennis narrative, he found a need to rekindle the passion he had for tennis and took a seasonal position at the Gordon Hughes Tennis Club. In 2009, he worked at The Northcliffe Tennis Club (under lease ownership of Glenn Dodge) before being hired in 2010 under contract by T.N.S own Marijke Nel for the Courtyard Tennis and Fitness Club as fitness manager and instructor.

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David won the prestigious Nova Scotia Open Mixed Doubles title with Penny Kuhn in 2010. He formed Greer Management Consulting and started the first ever tennis program at the new Canada Games Centre in September 2011. The entrepreneur and lifelong tennis coach and trainer formed Tennis Time in May of 2016. He is a current member of the Tennis Professionals Association (TPA), certified by Tennis Canada, a member of Tennis Nova Scotia and former member of the OTA, U.S.T.A, USPTA and R.B.T.F. He continues to grow the game throughout the Halifax Regional Municipality public and private facilities through Tennis Time and Kids Tennis Time.