Having attended Trinity College, Dublin from 1694, he was working at the Drury Lane Theatre by spring 1703 with Christopher Rich. He also adapted Molière's L'amour médecin as The Quacks, putting it on at the Drury Lane Theatre on 29 March 1705. With the rest of Rich's party, he was evicted from Drury Lane in 1709 by William Collier. In the meantime, in 1706, he had leased the Queen's Theatre in the Haymarket from Sir John Vanbrugh, quarrelled with Rich and poached Colley Cibber from him. After initial success with plays and opera there, Collier's court intrigues against Swiny led to his bankruptcy by January 1713. He then went travelling in France, the Netherlands and Italy, settling in Venice by 1721 as an agent signing Italian opera talent and works for the London stage and commissioning works from Italian artists for collectors back in England - those artists included Antonio Canaletto and Rosalba Carriera. With Charles Lennox, 2nd Duke of Richmond as the project's main patron, Swiny got together a Venetian-Bolognese team of painters in the 1720s to produce a series of 24 tomb paintings with allegories of recent English history, especially the Glorious Revolution. He tried to have the paintings engraved in a single volume, publishing the prospectus To the Ladies and Gentlemen of Taste of Great Britain and Ireland in the 1730s to try to raise the funding for this by subscription. When the volume finally came out in 1741, as Tombeaux des princes, grands capitaines et autres hommes illustrés, qui ont fleuri dans la Grande-Bretagne vers la fin du XVII et le commencement du XVIII siècle, it included only 9 of the paintings, but Swiny still planned a second series of six such paintings on the duke of Marlborough's deeds that remained incomplete on his death. In around 1733, after about 20 years abroad, Swiny came back to London, where he won posts in the custom house and as storekeeper at the king's mews. Benefit nights for him followed in 1735 and 1736, with the Opera of the Nobility's directors in 1736 considering sending him back to Italy to recruit singers. In 1737 he sat for his portrait from Peter van Bleeck, and the following year Jean Baptiste van Loo and Andrea Soldi also painted him. In around 1749 Swiny made a trip to Paris for John Rich, to arrange the London tour of Jean Monnet's troupe, before dying in London in 1754 and being buried in St Martin-in-the-Fields. His estate was left in trust for the actressMargaret Woffington, with his will leaving as trustees Robert Maxwell and Francis Andrews.
