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Killian O'Leary practices corporate law with a focus on M&A, equity capital markets, and private equity transactions. He has represented clients in domestic and cross-border mergers, acquisitions, corporate restructurings, and fundraisings.

Prior to joining Jones Day in 2022, Killian worked in the M&A department of a leading Irish law firm.


  • J.M. Huber acquires Biolchim GroupJones Day advised J. M. Huber Corporation in the acquisition of Biolchim Group, a leading producer and distributor of specialty plant nutrition and biostimulants, from private equity firms NB Renaissance and Chequers Capital and the Biolchim Group management team.
  • UPL sells stake in Advanta Enterprises to KKRJones Day advised UPL Limited in its $300 million sale of a 13.33% stake in its subsidiary, Advanta Enterprises Limited, to KKR.
  • Cohort Go sold to Flywire Inc.Jones Day advised Cohort Go, a leading fintech business headquartered in Australia, in the sale of the company to Nasdaq listed Flywire Inc., a global payments enablement and software.
  • Andrew Dzurak and Allectus Capital create leading quantum computing company, Diraq Pty LtdJones Day acted for Professor Andrew Dzurak and Allectus Capital, in the creation of a leading quantum computing company, Diraq Pty Ltd (formerly, SiMOS Newco Pty Ltd) whose founding shareholders consist of the University of New South Wales, Allectus Capital and Professor Dzurak.
  • EagleTree Capital portfolio company acquires bChannelsJones Day advised EagleTree Capital in connection with the acquisition and financing by portfolio company The Channel Company of bChannels, a leading global marketing and data services agency specializing in the technology channel.