He advises on complex international disputes, casualties as well as a broad variety of contractual issues, with particular experience in cross-border enforcement and multi-jurisdictional cases.

Jonas advises on contentious and non-contentious domestic and international commercial matters, with a particular focus on disputes and advisory work arising out of contracts for works and services. His practice regularly involves cross-border elements, and he has advised on contractual and procedural issues across multiple jurisdictions, including the obtaining and enforcement of both domestic and foreign arbitral and judicial awards. Jonas is accustomed to working closely with lawyers, experts and practitioners from different legal systems and professional backgrounds.

He also advises on infrastructure projects, in particular in the fields of fibre optic networks and energy supply infrastructure. His work in this area includes transactional advice as well as contractual support relating to construction, use and operation of infrastructure assets.

Jonas has broad experience in commercial casualty matters involving damage to property, including complex loss scenarios with multiple damaged and damaging parties. He undertakes comprehensive factual and legal reviews, including on-site and off-site fact finding, and manages extensive casualty cases from an early emergency phase through to settlement or enforcement.

He is experienced in maritime emergency management and regularly advises on maritime casualties, including general average (Havarie Grosse). His work includes the legal structuring and coordination of rescue and mitigation measures, as well as the legal support required to safeguard and enforce claims following maritime incidents.

Jonas has more than ten years’ experience advising on all legal aspects of inland navigation (Binnenschifffahrt). His work in this field covers the handling, negotiation and resolution of casualties and incidents, including groundings and collisions, cargo damage, delay claims, fires, shipyard and repair contracts, as well as other operational and contractual disputes. He has advised on the full lifecycle of such matters, from the immediate response and factual investigation through to settlement negotiations and judicial or arbitral proceedings, and continues to regularly act on inland navigation matters for insurers, operators and other industry participants.

Jonas frequently advises maritime industry participants as well as their sub-suppliers and subcontractors in relation to contracts for works and services. This includes assistance with contract negotiations as well as the enforcement and defence of warranty claims and other contractual claims arising during or after project execution.

• Processing cargo damage claims brought by a Qatari consignee against the French cargo insurer of a German carrier in connection with damage incurred during a Mediterranean voyage.
• On site and off site emergency handling of governmental and private investigations following the grounding of a container vessel on behalf of an insurer, including the conduct of settlement negotiations in the aftermath of the casualty.
• Acting for an insurer in defending governmental and private claims arising out of the sinking of a barge in the Port of Hamburg.
• Judicial enforcement of damage claims on behalf of the owner of railway carriages following a derailment.
• Extrajudicial and judicial enforcement of damage claims on behalf of an onshore wind energy provider and its insurer following the collapse of a wind turbine at a construction site.
• Handling warranty claims asserted by and against (sub )contractors providing construction services within the shipbuilding industry.
• Advising on and negotiating the acquisition of a partial network of a fibre optic infrastructure provider, including the transfer of passive and active technical components as well as customer bases.
• Advising on lease, usage and tenancy agreements as well as construction measures in connection with the expansion of a port facility and the conversion of a substation.
• Comprehensive handling of a general average (Havarie Grosse) involving sensitive cargo (food products) following water ingress, including the organisation and structuring of salvage and mitigation measures as well as the legal support and safeguarding of claims.
• Advising the owner of an inland navigation vessel following a fire on board caused by welding works carried out by a shipyard, including the investigation of the cause of loss and the assertion and defence of liability and damage claims.
• Advising on a shareholder dispute, including the exclusion of a shareholder and the conduct of settlement negotiations.
• Advising and representing the contractor of an offshore substation in out of court and court proceedings following a transformer fire on an offshore substation, including the enforcement and defence of contractual and tortious claims.
• Advising and representing the contractor of an offshore substation in out of court and court proceedings following damage to the offshore substation incurred during the lifting and installation onto pre installed monopiles.
• Advising a client on the purchase and sale of CO₂ quotas within the meaning of the German Federal Immission Control Act (Bundes Immissionsschutzgesetz – BImSchG), including contractual structuring and regulatory considerations.
• Surveillance and subsequent arrest of a Hong Kong‑flagged vessel in Indian waters following a collision with a German‑owned vessel in Turkish waters, including the successful enforcement of damage claims against the arrested vessel

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