GAR 100 - 11th Edition

Zeiler Partners

Professional notice

Successfully defended the Czech Republic in two treaty disputes

People in Who’s Who Legal5
People in Future Leaders1
Pending cases as counsel9
Value of pending counsel workUS$2 billion
Treaty cases2
Current arbitrator appointments10 (of which 6 are as sole or chair)
Lawyers sitting as arbitrator3

Zeiler Partners was founded in Vienna in 2014 by Gerold Zeiler, the former head of the arbitration practice at another GAR 100 firm from Austria, Schönherr. He brought a team with him to the new boutique.

A former president of the Austrian Arbitration Association, Zeiler regularly sits as arbitrator and is a fellow of the Chartered Institute of Arbitrators. He’s joined at the new firm by partners Lisa Beisteiner and Alfred Siwy, who bring years of experience in ICSID and UNCITRAL work.

In 2015, the practice recruited another Schönherr alumnus, Markus Schifferl, who joined as partner from rival boutique Torggler; and of counsel Christoph Schreuer, a renowned academic who authored the definitive commentary on the ICSID Convention and often sits as arbitrator.

Who uses it?

Governments use the firm for investment treaty work. It has defended the Czech Republic in three such cases and is acting for Bosnia-Herzegovina in a €700 million Energy Charter Treaty claim at ICSID brought by a Slovenian company.

In commercial arbitration, it has advised high-profile names from several industries, including Shell, RWE, Deutsche Bank, Ikea and car companies Fiat and Seat.

It has a particular niche in disputes relating to the gas market. Examples include acting for a Russian gas company in a dispute over a €2 billion contract; and an Italian gas trader in a €25 million dispute with a German energy group.

Recent events

A team led by Alfred Siwy helped the Czech Republic defeat a pair of investment treaty claims brought by British investors in a car parts business. An SCC tribunal dismissed the case in 2017. The firm continues to defend the state against an expropriation claim by a producer of aids for the visually impaired, having succeeded in barring other claims at the jurisdictional stage.

It also helped an Italian plant manufacturer win the dismissal of a set-aside action in the Austrian Supreme Court. As arbitrator, Gerold Zeiler was part of an ICC panel that issued a €401 million award in favour of Romania in 2017, requiring Italy’s Enel to honour a put-option clause and increase its stake in a privatised electricity company.

Client comment

Péter Annus, a managing director at Ikea, praises Zeiler Partners’ ability to “align arbitration strategy to our company needs. He says the team’s performance was “solid and reliable”.

A lawyer at the Czech finance ministry says it is “very happy” with the firm’s work on its behalf. “Zeiler Partners are a pleasure to deal with and provide excellent value for money. Alfred Siwy impressed us with his hands-on approach and extensive knowledge of public international law.”

A German business advisory company with whom the firm has worked describes it as “one of the go-to firms for arbitration in Austria”, adding: “They have very good business acumen, a lucid mind and a cooperative working style. They are passionate and detail-oriented in those areas of the case where it is required. They are a winning team.”

zeiler.partners is a dispute resolution boutique. It is a growing law firm with currently five partners, one of counsel and ten associates.


Four of the firm’s partners are concentrating on international commercial arbitration and investment arbitration. Although the firm only was founded in 2014, all partners have considerable experience and are well-regarded specialists in their fields of law. The team has a wide range of experience in arbitrations under the ICC, UNCITRAL, VIAC Rules and in disputes arising from bilateral investment treaties (including the representation of investors and governments in ICSID arbitration proceedings and investment arbitrations conducted under the UNCITRAL Arbitration Rules and Stockholm Rules). They regularly sit as arbitrators. A special focus of the firm lies on energy and investment arbitration. The partners of zeiler.partners also represent clients before Austrian courts in all areas of commercial law.

The partners of zeiler.partners have chosen the smaller setting of a boutique firm where their full attention lies on the personal service to their clients.

For further information please contact

Gerold Zeiler, partner, [email protected], +43 1 890 10 87 80

Alfred Siwy, partner, [email protected], +43 1 890 10 87 84

Lisa Beisteiner, partner, [email protected], +43 1 890 10 87 83

Markus Schifferl, partner, [email protected], +43 1 890 10 87 71

Christoph Schreuer, of counsel, [email protected], +43 1 890 10 87 70

Stubenbastei 2 (entrance: Zedlitzgasse 7), 1010 Vienna, Austria

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