General Enquiries & Auction Estimates

For general enquiries about buying and selling at Christie’s, please contact Client Service at info@christies.com or by telephone at +44 (0)20 7839 9060 (London) or +1 212 636 2000 (New York).


For estimate requests, feel free to use our online Auction Estimates service or contact one of our Specialist Departments directly.

Find a Specialist Near You

Find a specialist near you
Christie’s global presence is spread across a network of international salerooms and 61 representatives and offices.

Senior Management Team

  • Zita Gibson

    Senior Director, Head of Estates, Appraisals & Valuations and Private & Iconic Collections, EMEA

    BIOGRAPHY

    Zita is Head of Estates, Appraisals & Valuations and Private & Iconic Collections, having joined Christie’s in 2007 following an MA in Classics at Trinity College, Oxford University and an MA at the Courtauld Institute of Art. She has orchestrated and overseen many multi-category proposals, pitches and collection sales, acting as the main liaison between vendors and the business throughout the valuation and sale process. Most recent highlights include The Roger Federer Collection (2021), Julians Park and Six Private Collections (2021), The Collection of Mrs Henry Ford II (2021), Alexandra Tolstoy: An Interior by Sibyl Colefax & John Fowler (2020), The George Michael Collection (2019), An Adventurous Spirit: An Important Private Collection Sold to Benefit a Charitable Foundation (2018/2019), Old Masters/New Scholars: Works of Art Sold to Benefit Rugby School (2018), Thomas Chippendale 300 Years (2018), The Collection of Raine Countess Spencer (2017) , and Christie’s 250th Anniversary Defining British Art Auction and Loan Exhibition (2016).

    Zita Gibson

    Name:Zita Gibson

    Position:Senior Director, Head of Estates, Appraisals & Valuations and Private & Iconic Collections, EMEA

    zgibson@christies.com
  • Ruth Cornett CTA TEP

    Senior Director, Heritage & Taxation Advisory Service

    BIOGRAPHY

    Prior to joining Christie’s, Ruth Cornett worked as a tax adviser in a number of professional firms in the City and the West End of London. After training as an art historian and working as a curator in the V&A, Ruth changed careers in 1992, studying law and qualifying as a Chartered Tax Adviser (CTA) in 1998. Ruth has advised a broad spectrum of clients on a range of tax matters with a particular emphasis on capital gains tax, inheritance tax and income tax. To consolidate her expertise in these areas, Ruth qualified as a Trust and Estate Practitioner (TEP) in 2008. Ruth lectures frequently for Christie’s Education and STEP on tax and heritage matters, has contributed to leading publications in this field and sits as an observer on the Tax and Political Committee of Historic Houses (HH).

    cornett-ruth

    Name:Ruth Cornett CTA TEP

    Position:Senior Director, Heritage & Taxation Advisory Service

    rcornett@christies.com
  • Tom Legh Tep

    Senior Director, Estates, Appraisals & Valuations and Private & Iconic Collections, EMEA

    BIOGRAPHY

    Tom Legh joined Christie's in 2008 and is a Senior Director in the Estates, Appraisals & Valuations department. Tom has extensive experience in managing complex UK and international valuations and devising optimum strategies for selling collections and individual works at auction, privately or to the nation. Skilled at anticipating the wide-ranging needs of clients, Tom has a particular focus on the issues facing UK heritage clients, including conditional exemption claims, offers in lieu and other tax planning exercises. He has an MA in History of Art and Architectural History from the University of Edinburgh, a Graduate Diploma in Law and is a STEP qualified Trust and Estate Practitioner. This broad skillset enables Tom to help clients navigate the complex issues which arise in the international art market.

    Tom Leth

    Name:Tom Legh TEP

    Position:Senior Director, Estates, Appraisals & Valuations and Private & Iconic Collections, EMEA

    tlegh@christies.com

Account Managers

  • Miriam Winson-Alio

    Account Manager, Director

    BIOGRAPHY

    Miriam Winson-Alio is a Director and Account Manager in London. She holds a Bachelor in Business Administration from Spain and a Postgraduate degree in Art History from Cambridge University, later gaining an M.Litt. from Glasgow University. Prior to joining Christie’s she had a successful career in Trade-Finance and was based in Switzerland. Miriam joined Christie’s in the Old Masters & 19th Century Art department in 2010, where she played a pivotal role co-ordinating some of the most successful auctions to date. In 2012 Miriam transitioned to Estates, Appraisals & Valuations and has since managed complex multi-category projects globally. Her languages and international professional experience bring wider knowledge and a broader perspective to the team.

    Miriam Winson-Alio Image

    Name:Miriam Winson-Alio

    Position:Account Manager, Director

    mwinson-alio@christies.com
  • Georgie Mawby Tep

    Account Manager, Director

    BIOGRAPHY

    Georgie is a Director and Account Manager in London. Georgie joined the Christie's Heritage and Taxation Advisory Service in 2010, before becoming an Account Manager in the Estates, Appraisals & Valuations department in 2014. Georgie works with a diverse range of private clients, trusts, and estates on issues relating to the valuation of works of art and collection management. She has a particular interest in the issues facing UK heritage clients including the preparation of complex valuations for probate, negotiated sales to the nation in lieu of tax, and conditional exemption claims. Georgie has extensive experience in managing valuations of works of art in the UK and worldwide for sale at auction, private sale, and negotiated sales to museums across the UK. Georgie holds a BA (Hons) in History of Art from the Courtauld Institute of Art and is a qualified member of the Society of Trust and Estate Practitioners (STEP).

    Georgie Mawby Image

    Name:Georgie Mawby TEP

    Position:Account Manager, Director

    gmawby@christies.com
  • Susann Theuerkauf

    Account Manager, Director

    BIOGRAPHY

    Prior to joining Christie’s, Susann read law at Westfalische-Wilhelms Universität, Münster, Germany before earning a Masters Degree in Business, from the HULT Business School, London. Susann joined the Estates, Appraisals & Valuations department in 2012, and was appointed Associate Director in 2018. She has extensive experience in managing complex international valuations in preparation for auction, notable examples include Works from the personal collection of Barbara Lambrecht (2017), Art for Future: Selected works from the UniCredit Group (2019), and a selection of around 200 works from The Deutsche Bank Collection (2020). As a German native, Susann has a particular focus on German speaking regions as well as specific knowledge of the local jurisdictional requirements which enable her to assist with financial planning, insurance and tax.

    Susann Theuerkauf

    Name:Susann Theuerkauf

    Position:Account Manager, Director

    stheuerkauf@christies.com
  • Hannah Boissier

    Account Manager, Director

    BIOGRAPHY

    Hannah Boissier holds a BA in History of Art from the University of Leeds and spent time working in a contemporary art gallery before joining the Estates, Appraisals & Valuations department in 2012. Having become an Account Manager in 2016, she was appointed Associate Director in 2018. Hannah manages both UK and international valuations in preparation for auction, most notably, Annabel’s (2018), The Jeremy Lancaster Collection (2019), and The L’Wren Scott Collection (2021). Hannah also has extensive experience managing the complex requirements of international clients and is versed in project management spanning various countries and jurisdictions.

    Hannah Boissier Image

    Name:Hannah Boissier

    Position:Account Manager, Director

    hboissier@christies.com