Martin Brumberg

Managing Partner - Operations & Finance

Martin is a mathematician who joined the reinsurance industry in 2007. He worked as treaty underwriter, as reinsurance manager of an insurance pool and as reinsurance broker in the Continental European and London markets. Martin started his career with Swiss Re as one of the Swiss Re Academy’s graduates. He is one of the founding partners and managing directors of gmbc group responsible for operations and finance. Martin and his team are based in Hamburg and focus on administrative, operational and all other technical support for our clients.


Sergey Grazhdankin

Managing Partner - Business Development

Sergey started out insurance career in 2002. Since then he has held various positions in general insurance and reinsurance underwriting as well as reinsurance broking in Continental Europe and the London market. Having started in the large P&C projects department of an insurance company, he has gained broad technical know-how over several years with both Munich Re and Swiss Re in Germany, and on the broking side with Willis Global, Willis Re and JLT Re in London. Sergey and his team are based in our London office and look after gmbc group business development, marketing and sales.


Uwe Focht

Managing Partner - Reinsurance Services

Uwe started his career in the insurance industry in 2003 as a lecturer in insurance economics and reinsurance at the University of Hamburg. From 2007 he worked for Swiss Re underwriting Property and Casualty business in various markets across Europe and Asia. Before joining gmbc group in February 2016, he was Swiss Re’s Head of Property Treaty Underwriting for China, based in Beijing. Uwe is one of the managing directors, based in Hamburg, with an overall responsibility for Reinsurance Services. He has a Diploma in Mathematics and Business Administration and a Ph.D. in Insurance Economics.


Robin Merttens

Partner - Technology

Robin was at Heath Lambert in various senior management roles for twelve years before changing career in 2000 to found and build “e-Lloyd’s”. He was COO and later CEO of that business which pioneered the move to electronic placement of insurance in London. In the 13 years he was there he built a reputation as a visionary with the ability to articulate and sell innovative services and technology. His unusual mix of experience comprises legal, procurement, M&A, insurance and technology. Based in London, his speciality is the launch and development of new innovative products and services to the insurance market.


Key Contacts

Veith Huesmann

Operations & Finance

Derya Tüncel

Operations & Accounting

Mascha Buxbaum-Parikova

Reinsurance Services

Alexander Farafonov

Delegated Underwriting Authority

Structuring & Reinsurance

Stefanie Koch

Regulatory & Compliance

Elena Năstase


Andre Sasongko


Jan-Peter Graeff


Ema Oprea


Maria Grazhdankin