# Toffer Winslow

> Toffer Winslow is the CEO and a board member of Diffblue, an Oxford-spun AI company that uses reinforcement learning - not large language models - to automatically write unit tests for Java code, at a pace of roughly one test every two seconds. A three-decade enterprise-software operator, he has run go-to-market and led companies through the growth-and-exit cycle at Dynatrace, RSA Security, Lavastorm, Tamr, and StackState (which he steered into an acquisition by SUSE). At Diffblue he is selling deterministic, on-premises AI to some of the most security-anxious buyers on earth: four of the ten largest U.S. banks, plus Citi, ING, Cisco, AstraZeneca, and BNY Mellon.

- **Role:** Chief Executive Officer & Board Member at Diffblue
- **Organizations:** Diffblue, StackState, Tamr, Lavastorm Analytics, Dynatrace, RSA Security
- **Nationality:** American
- **Education:** MBA, Harvard Business School, BA, University of British Columbia
- **Known for:** Leads Diffblue, whose customers include four of the ten largest U.S. banks plus Citi, ING, Cisco, AstraZeneca, and BNY Mellon, Oversaw a $6.3M Series A extension in 2024 that brought Citi in as both customer and equity investor, pushing total funding past $46M, As StackState CEO, led the company through to an acquisition by SUSE

## Career timeline

- **1990s-2000s** — Chief Marketing Officer at Dynatrace, building the global marketing engine that drove 100%+ yearly growth ahead of the company's acquisition
- **2010s** — Chief Revenue Officer and General Manager at Lavastorm Analytics (later part of Precisely)
- **2018** — Chief Business Officer at Tamr; led the company's $28M capital raise and initiatives driving 100%+ annual growth
- **2021** — Named Chief Executive Officer of StackState (July 22, 2021), later leading it toward acquisition by SUSE
- **2024** — Serving as CEO & Board Member of Diffblue; oversaw a $6.3M Series A extension with Citi joining as a new investor
- **2025** — Diffblue launches next-generation Cover platform with Test Asset Insights, LLM-Augmented Intelligence, and Guided Coverage Improvement; raises Series A round

## Achievements

- Leads Diffblue, whose customers include four of the ten largest U.S. banks plus Citi, ING, Cisco, AstraZeneca, and BNY Mellon
- Oversaw a $6.3M Series A extension in 2024 that brought Citi in as both customer and equity investor, pushing total funding past $46M
- As StackState CEO, led the company through to an acquisition by SUSE
- Led Tamr's $28M capital raise in 2018 and 100%+ annual growth as Chief Business Officer
- Built Dynatrace's global marketing engine, contributing to 100%+ yearly growth before its acquisition

## Latest updates

- **2024-10** — Diffblue secured a $6.3M Series A extension amid a 3x growth period; Citi joined as a new equity investor, total funding surpassing $46M.
- **2025-11** — Diffblue's most recent raise (Series A) recorded, per profile data, with a latest funding amount of $3.2M.
- **2025** — Diffblue launched the next generation of its flagship Cover platform with three new capabilities: Test Asset Insights, LLM-Augmented Intelligence, and Guided Coverage Improvement.

## Links

- Website: https://www.diffblue.com
- LinkedIn: https://www.linkedin.com/in/toffer/

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Profile page: https://yespress.io/toffer-winslow
Published by YesPress — https://yespress.io
Last updated: 2026-07-08