Jan Gehl, the Danish architect and urban planner behind the world's longest pedestrian street, in Copenhagen, will have a film of his screened today in Wan Chai's Agnes b Cinema as part of the Bi-City Biennale of Urbanism and Architecture. The 79-year-old Gehl has worked over the years to improve the livability of cities, seeing them more as places for humans instead of vehicles. He has worked on projects in Sao Paolo, New York and Mexico City and, a few years ago, he sat down to dinner with Moscow's mayor, to update him on the "Copenhagenisation" of the Russian capital. The mayor's name was Sergei Sobyanin …

Sobyanin grew up in Siberia and was once President Vladimir Putin's chief of staff. Although he has a reputation for being an efficient manager, Sobyanin rarely gives interviews and photographs of him are few and far between. In 2011, the mayor banned the city's gay pride parade, saying that "Moscow does not need" it and that he is "not a supporter" of such events. The activists held the parade anyway, and dozens were arrested. In response, Sobyanin was described as a "coward" by actor Ian McKellen …

Best known for his roles as Gandalf in The Lord of the Rings and Magneto in the X-Men films, McKellen has also played most of the major Shakespearean heroes and villains. Born and raised in northern England, he saw his first play (Peter Pan) at the age of three, made his stage debut aged six and today has more than 50 international acting awards to his name. In August, he was staying in a friend's Manhattan apartment when he was suddenly evicted. The reason? The property had been bought by Taylor Swift …

Hailed by Billboard magazine as the "rarest of pop phenomena" - someone who has made the transition from country music to the mainstream - 26-year-old Swift is perhaps "the sharpest, savviest, populist singer/songwriter of her generation". She exerts an enormous amount of influence on the music business: within a day of writing a complaint against Apple Music's planned policy of not paying royalties during a three-month trial, the company backed down. Last year, Time magazine named her one of the "icons" on its 100 most influential people in the world list. Among the other 11 icons, alongside Pope Francis and Brazilian surfer Gabriel Medina, was Diane von Furstenberg …

Born Diane Simone Michelle Halfin in Belgium, von Furstenberg was raised by a Romanian father and Greek-born Jewish mother who had survived the Holocaust. The fashion designer married German prince Egon von Furstenberg in 1969 and, after their shortlived marriage, retained his surname (although she could no longer use the title "princess"). A "high priestess of the fashion tribe", as The New York Times calls her, von Furstenberg invented the iconic wrap dress in 1974. Outside of the fashion world, she has, along with the likes of Jay-Z and David Byrne, "starred" at New York City Department of Transport press events, having been enlisted by the media savvy Janette Sadik-Khan …

As New York's transport chief from 2007 to 2013, Sadik-Khan, a former senior vice-president of one of the world's biggest engineering firms, made it her goal to make the Big Apple a better place for everyone, transforming its car-jammed streets with hundreds of miles of bike lanes, introducing the country's largest bike-sharing programme, pedestrianising plazas and reimagining Times Square. In her efforts to make the city more liveable, she hired an urban planning giant soon after she took office. That person was Jan Gehl.