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    Portugal · Greece · Malta

    Onur Sümer

    Attorney at Law, Managing Partner at GSC International

    Onur Sümer is GSC International’s managing partner and an attorney registered with the Istanbul Bar Association. His official biography says he studied law at Paris 1 Panthéon-Sorbonne University and Istanbul University and advises on corporate, commercial, international and banking law. It also describes cross-border advisory work in Europe and the UAE, fluency in Turkish, French, English, Italian and Spanish, and service as Honorary Consul of the Slovak Republic in Türkiye since 2016.

    Regulator
    Istanbul Bar Association (firm-published registration)
    Status
    On file
    Record reviewed
    6 Aug 2026
    Request a consultation with OnurEnquiries are handled by GSC International, not directly by Onur.
    Directory listing. We reviewed this listing on 6 Aug 2026 but no complete bar registration is on file for Onur. How we verify

    What Onur does

    Jurisdictions
    Portugal, Greece, MaltaFirm level
    Works in
    Spanish, French, Italian, English
    Relationship to the firm
    Partner

    Routes Onur handlesFirm level

    Credentials

    Professional registration

    Istanbul Bar Association (firm-published registration)

    No registration number on file

    Education

    • Legal studies

      Paris 1 Panthéon-Sorbonne University

    • Law degree

      Istanbul University

    Working with Onur

    Enquiries
    Handled by GSC InternationalFirm level
    First consultation
    Not stated
    Typical engagement fee
    Not stated
    Typical first reply
    Not stated
    Languages of engagement
    Spanish, French, Italian, English

    Common questions

    What is Onur Sümer’s role at GSC International?

    He is the firm’s managing partner and an attorney. GSC International presents him as a senior cross-border adviser working across its international office network.

    Is Onur Sümer admitted to a bar association?

    GSC International identifies him as an attorney registered with the Istanbul Bar Association. This is firm-published information; an independent regulator-directory match was not located during verification.

    Where did Onur Sümer study law?

    GSC International says he studied law at Paris 1 Panthéon-Sorbonne University and Istanbul University. The biography does not publish graduation years or the exact award titles.

    What legal work does Onur Sümer handle?

    His firm biography describes work in corporate, commercial, international and banking law, including cross-border advisory matters in Europe and the United Arab Emirates.

    What languages does Onur Sümer speak, and does he hold a diplomatic role?

    GSC International’s biography says he is fluent in Turkish, French, English, Italian and Spanish. It also says he has served as Honorary Consul of the Slovak Republic in Türkiye since 2016.

    This record

    On file
    The regulator. No complete registration: one of the regulator or the number is missing.
    Record reviewed
    6 Aug 2026
    Next review
    6 Aug 2027
    Not confirmed
    We have not recorded an independent match of this registration against the regulator's register.

    Are you Onur, or from GSC International? Claim and complete this profile. How we verify

    Request a consultation with Onur