septembre 25 2026

Mayer Brown strengthens leading insurance transactions platform with addition of John Grothaus in Chicago

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CHICAGO – Mayer Brown announced today that John Grothaus has joined the firm as a partner in its Corporate & Securities and Global Insurance practices in Chicago, further strengthening the firm's market-leading insurance transactions platform. John joins from Sidley Austin LLP.

John advises insurance, financial services, and private equity clients on a broad range of corporate and securities matters, including mergers and acquisitions, capital investments, public and private securities offerings, reinsurance transactions, and complex insurance financings. He is particularly known for his work in the life insurance sector, where he advises clients on sophisticated transactional matters involving strategic equity and hybrid capital raises, funding agreement-backed note transactions, strategic reinsurance arrangements, and cross-border transactions, including throughout the Asia-Pacific region, including a market-leading practice in outbound reinsurance from the Asia-Pacific region.

"John's arrival reflects our continued investment in the insurance and financial services sectors and our commitment to building one of the industry's premier transactional platforms," said David Alberts, co-leader of Mayer Brown’s Corporate & Securities practice. "He brings a strong combination of technical excellence, deep industry knowledge, and a client-focused approach that will further enhance our ability to advise clients on their most important strategic transactions."

"I am thrilled to join Mayer Brown," John said. "The firm has built a truly exceptional insurance platform with deep transactional, regulatory, and international capabilities. I was particularly attracted to the firm's collaborative culture, global reach, and commitment to helping lawyers build and grow their practices. I look forward to working alongside my new colleagues to help clients capitalize on opportunities across the insurance and financial services industries."

The addition of John further strengthens Mayer Brown's ability to advise insurers, reinsurers, asset managers, private equity sponsors, and other market participants on complex transactions throughout the insurance lifecycle. His experience in reinsurance, insurance-linked capital solutions, and international insurance transactions enhances the firm's capabilities in areas that continue to experience significant growth and innovation.

"John is an outstanding addition to our Chicago office and our global insurance team," said Joanna Horsnail, managing partner of Mayer Brown's Chicago office. "His experience advising clients on complex insurance and financial services transactions, coupled with his collaborative style and entrepreneurial mindset, make him an excellent fit for our firm."


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