Borkowski’s first job was as the in-house publicist at the Wyvern Theatre, Swindon promoting touring productions and producing poetry and rock events. He moved on to the Theatre Royal, Stratford East, in 1981. The first production he promoted was Nell Dunn's Steaming, starring Brenda Blethyn and six other naked actresses. One of his early publicity stunts there was to “kill off” a tap-dancing dog to promote an amateur variety night. He also produced more music and performance poetry events.

After leaving Stratford East in the mid 1980s, he became a freelance publicist, specialising, uniquely at the time, in theatre and circus, including avant-garde and world theatre and innovative site specific producers, while also working for West End theatre. For The Pirates of Penzance launch in 1986 at the Palladium, he organised a sword-fighting workshop for the cast with Douglas Fairbanks, Jr.

Borkowski has had a long association with the Edinburgh Festival; to publicise Archaos, the grunge circus, he organised a series of jumps on motorbikes over traffic queues in the centre of Edinburgh in 1988 and staged the first UK Cowpat flinging competition to launch Hank Wangford at the Festival in 1989.

He founded Borkowski PR in 1987. The company works on consumer brands, celebrity and arts and entertainment. They have worked with Michael Jackson (briefly), Noel Edmonds, Cirque du Soleil, Stomp, Michael Flatley, The Three Tenors, Eddie Izzard, Joachim Cortez, Led Zeppelin, Virgin Megastore, Horlicks, American Express, Oxfam, Amnesty, Selfridges, Vodafone, Harrods, Cadbury, Mamma Mia and Sony UK Ltd amongst others.

In 1994 Borkowski created a cause celebre and front page outrage when he publicised the London production of the controversial religious rock musical Bad Boy Johnny and the Prophets of Doom. In 1996 Borkowski ran a “wild, rock’n’roll campaign” for Carlsberg-Tetley's Thickhead brand of alcopops that resulted in a huge media backlash against alcopops, which were already controversial, and the withdrawal of the product within hours of its launch. The press attention he and his company generated for Archaos in 1990, following tabloid coverage of “nude trapeze artists and men dancing together”, stirred Bristol Council into banning the circus from appearing on the downs. The Borkowski campaign to promote the performance poet Murray Lachlan Young also ran into difficulties when the poet, overwhelmed by the media attention, retreated from public life and performance for four years..

Borkowski is responsible for helping to revive Noel Edmonds' career and helped deal with the press at Edmonds’ recent wedding, which was notable in that the photo rights were deliberately not sold to a celebrity magazines such as Hello! and OK!. Borkowski has also acted for celebrities in court, coaching them before they appear — notably in divorce cases for Slavica Ecclestone and Karen Parlour. Cliff Richard brought in Borkowski to work on the musical Heathcliff and also ran the campaign to get the singer’s Millennium Prayer to number one despite minimal radio airplay.

Borkowski has written two books on the subject. Borkowski’s own stunts include planting a field full of Cabbage Patch Kids for Hasbro, commissioning the world’s first chocolate billboard for Thorntons and creating a newspaper column for a cat (for Bacardi Breezer).

Borkowski was allegedly once frog-marched from the BBC for letting scorpions loose in a Green Room to promote the Jim Rose Sideshow tour in the UK; he also walked an elephant into a fish and chip shop with The Andrews Sisters to promote Trivial Pursuit. In 1988 he helped Ian Botham recreate Hannibal’s walk across the Alps, again with elephants. In 2000, he held a World Record Custard Pie Fight, involving 1,000 people, at the Millennium Dome.

In the 1990s, Borkowski worked for television shows such as The Word, Never Mind the Buzzcocks, Our Friends in the North and Cracker. Borkowski is now a regular TV and radio pundit on PR, the media and celebrity, often attacking the celebrity industry whilst still working within it. He lectures to the industry, to corporate trade associations and at academic institutions. His column, Stuntwatch, appears on The Guardian Online.

Borkowski received an Outstanding Achievement award from The Fringe Report in 2006, citing him for creating “a new branch of theatre — theatre of publicity” and from World's Fair, the circus industry's trade paper, for services to the circus in 2001. His company won the Gold Award from PR Week for Campaign of the Year in 2008 for their Wispa social networking campaign to relaunch the chocolate bar.

Borkowski has written two histories of public relations, focusing in particular on the art of the publicity stunt. Improperganda was published in 2001. The Fame Formula appeared in 2008. The latter, subtitled, How Hollywood's fixers, fakers and star makers shaped the publicity industry, sparked controversy when The Times suggested that one of the fakers and star makers in question, Maynard Nottage, was himself a fake, i.e. that he never existed. Borkowksi, according to the paper, may himself have been the victim of an elaborate hoax. The book started life as Sons of Barnum, a show by Borkowski at the Edinburgh Festival in 2004.

The Fame Formula received mixed reviews; the Guardian said that the Fame Formula “is a terrific, witty romp through the - often dirty - undies of the Hollywood fame factory and draws some interesting conclusions about modern-day celebrity culture” but a harsh critique from The Scotsmans book club led Borkowski to respond with a gift-wrapped pig's anus for each of the reviewers, a stunt borrowed from one of the publicists in the book, Jim Moran.