Thirty fashion designers, actresses, videogame creators, gymnasts, and pop singers have been chosen by Forbes magazine for its “30 Under 30” list of top achievers under 30 years old.

    They are considered the top 30 achievers in 15 categories ranging from education, energy, music, science and healthcare to sports, technology and marketing.

    The list included singers Bruno Mars and Justin Bieber, actresses Ashley and Mary Kate Olsen, fashion designer Alexander Wang, the newly appointed creative director at the French fashion house Balenciaga and gymnast Gabby Douglas.

    Some are returnees to the list that was launched last year, like British singer and new mother Adele, the 24-year-old multiple Grammy Award winner, and American entrepreneur Kevin Systrom.

    In energy, it is 28-year-old Leslie Dewan, a Massachusetts Institute of Technology graduate and co-founder and chief science officer of Transatomic Power.

    In music, Pittsburgh-bred Khalifa, 25, topped the list. Swift, the 29-year-old creative director at Airtight Games, was noted for creating hit videogame Portal.

    Sommer, the executive director of the Chordoma Foundation which raises funds for research into chordoma*, a rare, slow-growing bone cancer most commonly found in the spine, is another young achiever, according to Forbes.

    The full list will be published in the January 21 issue of Forbes and can also be found at www.forbes.com/under30.(SD-Agencies)