The faces of female inventors, innovators and scientists will dominate high-traffic outdoor sites in London and New York today, in an International Women's Day campaign by UNWomen.

In a campaign by Havas, designed to deliver over two million impressions in a single day, the campaign highlights women including Amy Williams, who founded ethical advertising platform Good Loop; Dr Christyl Johnson, the first African-American deputy drector at NASA and singer-songwriter Beatie Wolfe, who has researched the link between music and better outcomes in dementia patients. Shot by portrait photographers Bibi Cornejo Borthwick and Amy Troost, their faces are overlain by the title "Impossible to Ignore."

The campaign incorporates over 1,000 different appearances on digital, out of home and print platforms.Locations include New York City’s Times Square and JFK International Airport, the digital billboards of the World Trade Centre and Westfield London, the London Underground and railway stations across the U.K.

Members of the UN Women Global Innovation Coalition for Change (GICC) and Havas Group have secured media placements from partners and supporters around the world including NASDAQ, JC Decaux, The Economist, Walgreens, Westfield and Facebook.