Hanna is recognised as a “super star” in international arbitration. She is a Solicitor Advocate in the English Supreme Court and practises under her eponymous label www.hannaroos.com.  Hanna serves as counsel in arbitrations and litigations, and co-counsels with leading firms, including with Prof Gary Born at WilmerHale who comments that “Hanna is one of Europe’s rising international arbitration stars, with enormous talent, experience and energy”. She draws praise for her “tremendous”, “formidable” and “exceptional” skills as an advocate. Hanna also sits as arbitrator on one- and three-member tribunals on high value disputes and accepts arbitral appointments in all sector areas. Hanna was educated at Oxford University (PPE at Balliol) and Cambridge University (Law). She practised from 2007 to 2021 at Freshfields (then the #1 ranked practice by GAR), Latham & Watkins and Quinn Emanuel. Hanna serves as External Professor at Milan University.Her practice is fiercely client-centric, aimed at achieving an efficient resolution and preserving the parties’ commercial relationship. A client notes that “[w]e been delighted and impressed beyond words with [her] creative and intelligent approach […] She listens and delivers like no-one else we have ever worked with before! You can literally go to war with her – be it in the courtroom or the boardroom”.Hanna draws praise for her “strong understanding” of quantum issues, with the elite expert John Ellison at FTI noting that Hanna is “[a] total star – the best of her generation”.Hanna has represented some of the world’s largest companies and states under leading seats and rules, including the LCIA, ICC, HKIAC, SCC, UNCITRAL and ICSID. She covers most sectors.She is ranked "Global Leader" in “Who’s Who Legal: Arbitration” of 2022 and 2021, is on the International Arbitration Powerlist (UK) and ranked for International Arbitration in Legal 500 UK 2022, 2021 and 2020.Hanna is passionate about innovation, leadership and diversity - see www.hannaroos.com. She has drawn praise from colleagues as “simply perfect to work with” and “the best lawyer to work for”.Hanna hails from Finland where she spent her childhood building dens in the woods, caring for pets ranging from gerbils to lost dogs, playing the piano, singing in a Purcell opera (slightly off-key) and reading her Finlandia Prize-winning grandfather Antti Hyry’s books.Her free time revolves around her eyelid surgeon husband and cheeky sons, a muddy puppy, sailing, running and cycling by the soggy Thames.Sources of accolades: www.hannaroos.com.