About
Callum is an associate focusing on strategic and private capital M&A matters. His practice spans the full spectrum of M&A activity, including transformative public and private acquisitions, minority and strategic investments, joint ventures and carve-outs across high-growth technology and innovation-driven sectors.
Dual-qualified in California and England & Wales, Callum is able to provide seamlessly integrated advice on multi-jurisdictional transactions for his clients.
Callum also contributes to the firm’s thought leadership initiatives, including most recently the firm’s 12th Annual Spring Forum on M&A and the Boardroom.
Callum was previously based in our London office.
Additional Information
- Norlantic Capital on its strategic growth co-investment in Stephano Slack.
- ServiceNow on its $7.75bn acquisition of Armis (the client’s largest M&A transaction to date), and on its $750m investment in Genesys.
- Atlassian on its $610m acquisition of The Browser Company of New York.

Callum Riseley
Associate
Silicon Valley Office
855 Main Street
Redwood City, CA 94063