Key Takeaways
- • Brevan Howard has lost at least 10 senior technologists since Mike Sanders arrived as head of technology from JPMorgan in 2024, with the latest departures being CISO Charles Clarke and global head of infrastructure Kesh Iyer.
- • Charles Clarke, who joined Brevan only in November 2025, departed after a brief tenure; his exit follows the earlier departure of his predecessor Katherine Garrod to Marshall Wace, creating a second CISO turnover in rapid succession.
- • Kesh Iyer, who joined from Point72 in June 2024 and was promoted to global head of infrastructure in April 2025, has left the fund; the departure is thought to reflect Sanders' effort to consolidate leadership within his London-based senior technology team.
- • Brevan Howard is actively replacing departing technologists, having hired Ziad Afra from Schonfeld as head of core infrastructure and technology operations, and Mannoj Jammu Melwani from Bridgewater as a senior network engineer.
- • The technology departures signal ongoing organizational restructuring at the multistrategy macro hedge fund as new leadership consolidates its technical infrastructure function.
Summary
Brevan Howard's technology division continues to experience significant attrition, with two additional senior departures announced following a broader pattern of technologist exits since the arrival of Mike Sanders as head of technology in 2024. The latest departures are Charles Clarke, the fund's chief information security officer, and Kesh Iyer, global head of infrastructure. These exits bring the total count of departing senior technologists to at least 10 since Sanders' appointment.
Charles Clarke's departure is particularly notable for its speed. He joined Brevan in November 2025 and has already left the organization; the reasons for his exit remain unclear. Clarke's brief tenure at Brevan follows his previous role as head of security infrastructure at the London Stock Exchange Group. His departure marks the second CISO turnover at the fund in a short window, as his predecessor Katherine Garrod departed to join Marshall Wace after less than two years. Brevan declined to comment on Clarke's exit but will need to recruit a replacement CISO.
Kesh Iyer's departure reflects a different dynamic. Iyer joined Brevan from Point72 as head of platform engineering in New York in June 2024, subsequently advancing to global head of infrastructure in April 2025. His exit is thought to have occurred by mutual agreement as Sanders consolidates senior technology leadership within his London-based team. Iyer did not respond to requests for comment, and Brevan has not publicly disclosed details of his departure.
Despite the departures, Brevan Howard is actively recruiting replacement technologists. Ziad Afra, previously head of core infrastructure and technology operations at Schonfeld, is expected to join as Iyer's replacement. Additionally, Mannoj Jammu Melwani has joined from Bridgewater as a senior network engineer. These hiring moves suggest the fund is committed to rebuilding its technology infrastructure under Sanders' leadership, even as the broader attrition pattern raises questions about retention and organizational alignment within the technology function.
Charles Clarke's departure is particularly notable for its speed. He joined Brevan in November 2025 and has already left the organization; the reasons for his exit remain unclear. Clarke's brief tenure at Brevan follows his previous role as head of security infrastructure at the London Stock Exchange Group. His departure marks the second CISO turnover at the fund in a short window, as his predecessor Katherine Garrod departed to join Marshall Wace after less than two years. Brevan declined to comment on Clarke's exit but will need to recruit a replacement CISO.
Kesh Iyer's departure reflects a different dynamic. Iyer joined Brevan from Point72 as head of platform engineering in New York in June 2024, subsequently advancing to global head of infrastructure in April 2025. His exit is thought to have occurred by mutual agreement as Sanders consolidates senior technology leadership within his London-based team. Iyer did not respond to requests for comment, and Brevan has not publicly disclosed details of his departure.
Despite the departures, Brevan Howard is actively recruiting replacement technologists. Ziad Afra, previously head of core infrastructure and technology operations at Schonfeld, is expected to join as Iyer's replacement. Additionally, Mannoj Jammu Melwani has joined from Bridgewater as a senior network engineer. These hiring moves suggest the fund is committed to rebuilding its technology infrastructure under Sanders' leadership, even as the broader attrition pattern raises questions about retention and organizational alignment within the technology function.
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