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Hosea Haag

Hosea Haag

AMPERSAND Partnerschaft von Rechtsanwälten mbB.

AMPERSAND Partnerschaft von Rechtsanwälten mbB.

Germany • Intellectual property

1

Patent litigation: solicitors

Recently, the team at AMPERSAND Partnerschaft von Rechtsanwälten mbB. has focused particularly on expanding its client base in the telecoms sphere, while also maintaining a spread across all technology sectors. Hosea Haag and Jonathan Konietz are the key senior contacts; the former is frequently active in international litigation, while the latter regularly handles utility model disputes. Stefan Eck and Olaf Giebe joined the firm in January 2026 from KLAKA.
Legal 500 Editorial commentary
Phone
+498924295516
Email
[email protected]
Profile
ampersand.de

Profile

Work Department
Intellectual Property / Patent // Technical fields: telecommunications, electronics, mechanical engineering, medical devices, semiconductor technology
Position

Hosea Haag is a partner at AMPERSAND. His professional focus is patent law.

He represents clients in patent infringement proceedings before all German courts of instance and advises national and international companies in all matters of patent law. He structures and manages both international litigation series and individual infringement actions. The technical fields he covers include telecommunications, electronics, mechanical engineering and medical devices.

The JUVE Handbook describes Hosea Haag as a "highly experienced and smart tactician", while Legal 500 describes his advice in "highly complex cases" as "meticulously and calmly" and highlights his "excellent knowledge of the views of the courts".

The law firm AMPERSAND Partnerschaft von Rechtsanwälten mbB was in charge of the "Comparative Guide Germany: Patent Litigation" published in October 2022, for which Hosea Haag was co-author.

Career

1998 - 2002

Attorney-at-law at Coudert Brothers

2004 – 2009

Attorney-at-law at Bird & Bird

2009 – 2010

Attorney-at-law at Hammonds

2010 – 2011

Head of Patent Litigation at Eversheds

2012 – heute

Founder und Partner of AMPERSAND

Languages
German, English
Memberships
VPP / GRUR / AIPPI / LES
Education

1992 – 1998

First State Examination in Law, Friedrich-Alexander-Universität Erlangen Nürnberg

1999 – 2001

Second State Examination in Law , Assessor's Examination, Berlin Court of Appeal

2001 – 2003

Master of Laws (LL.M.) at the University of Exeter

Content supplied by AMPERSAND Partnerschaft von Rechtsanwälten mbB.

Testimonials

Collated independently by Legal 500 research team.

  • ‘Excellent technical expertise.’

    ‘This team has extremely high levels of technical expertise mixed with business understanding.’

    ‘Hosea Haag is extremely knowledgeable and very pragmatic in his approach.’

    ‘Highly experienced and dedicated team.’

    'What's special about the AMPERSAND team is the teamwork, meaning the collaboration between the partners and the associates. The strengths of each individual are clearly utilised. This also applies to collaboration with external patent attorneys.'

    'Hosea Haag: his many years of experience are evident, yet he still retains a boy's curiosity for technical and legal challenges. He brings calm even to complicated cases.'

Key clients

  • Arigna Technology Ltd. Brushgate Oy Ewikon Hirschvogel ImberaTek LLC Intent IQ Onebutton Pantech Corporation Quiss Qualitäts-Inspektionssysteme und Service GmbH Unwired Planet Wonderland Nurserygoods Co. Ltd. WSOU Investments LLC