He started out in a family business with his eponymous father and eldest brother William, and played a role in helping modernise the wholesale and retail grocery trade, consolidate it, and enable family grocery shop owners to adapt to the advent of supermarkets.
[citation needed] He was behind the first initiative of an Irish wholesale group to establish a bonded warehouse to expand their wine and spirits business.
[citation needed] Tyndall's aviation interests included involvement (as president) with the Leinster Aero Club, now based in TREVET (EITT), near Dunshaughlin, County Meath.
[citation needed] The Leinster Aero Club was founded in 1956 and originally based at Weston Aerodrome.
[citation needed] In addition to being president of the Leinster Aero Club, Tyndall was treasurer of the Aircraft Owners & Pilots Association and the Irish Aviation Council.