Slack Technologies, LLC
Leadership History
4 leaders · 2009 to present
Rob Seaman (EVP & General Manager) is the CEO of Slack, in the role since 2025. The first chief executive was Stewart Butterfield, from 2009.
| Name | Role | From | To | Years in role |
|---|---|---|---|---|
| Rob Seaman | EVP & General Manager, Slack | 2025 | Present | 1 |
| Denise Dresser | Chief Executive Officer | 2023 | 2025 | 2 |
| Lidiane Jones | Chief Executive Officer | 2023 | 2023 | < 1 |
| Stewart Butterfield | Co-Founder & Former CEO | 2009 | 2022 | 13 |
Slack replaced long email threads with persistent channels organized by team, project or topic. Messages, files and app alerts live in one searchable place, which made Slack popular with technology companies first and then with large enterprises. Since 2021 it has operated as part of Salesforce, which uses it as the collaboration layer across its cloud products. The company is headquartered in San Francisco, California.
Slack makes money from per-user subscriptions. Teams can start on a free plan with 90 days of message history, then upgrade to Pro (listed at $8.75 per user per month billed monthly, or $7.25 billed annually), Business+, or enterprise plans with central administration, compliance and data controls. Growth is bottom-up: small teams adopt the free product, usage spreads across departments, and IT later buys company-wide licenses. A Fair Billing Policy credits customers for licensed users who go inactive. After a 2025 plan overhaul, Slack stopped selling its separate Slack AI add-on and built AI features such as summaries, AI search and Slackbot into paid plans. Inside Salesforce, Slack is also sold alongside Sales Cloud, Service Cloud and Agentforce, which gives it access to Salesforce's enterprise sales force.
EVP & General Manager, Slack
2025 – Present
1 year (current)
Slack chief product officer who took over Denise Dresser's duties on an interim basis in December 2025 and was named EVP & GM of Slack in February 2026; led the Slackbot launch and the March 2026 AI feature release.
Chief Executive Officer
2023 – 2025
2 years
Dresser executes the massive, highly complex integration of Slack directly into Salesforce's broader 'Customer 360' ecosystem, aggressively attempting to justify Salesforce's massive $27.7 billion acquisition price.
As the current CEO (and former Salesforce executive), she acts as the absolute corporate anchor, tasked with heavily monetizing Slack within massive Fortune 500 enterprise accounts.
Chief Executive Officer
2023 – 2023
0 years
Jones briefly managed the incredibly turbulent transition period after Stewart Butterfield's resignation, heavily pushing the integration of generative AI tools directly into Slack channels before abruptly leaving to become CEO of Bumble.
Serving as CEO for less than a year in 2023, she attempted to stabilize the company following the massive exodus of the original founding team.
Co-Founder & Former CEO
2009 – 2022
13 years
As the visionary Co-Founder and former CEO, he completely revolutionized modern corporate communication, deeply embedding Slack's quirky, consumer-like design into the rigid enterprise software space.
Slack's main challenge is Microsoft Teams, which reached customers through Microsoft 365 bundles for years and now ships with Microsoft Copilot. Other pressures include proving the value of AI features now bundled into plans, leadership turnover (four different leaders since 2022), keeping third-party developers engaged as Slack's roadmap aligns with Salesforce priorities, and protecting customer data as Slackbot reads across channels, apps and calendars.
Rob Seaman serves as Executive Vice President and General Manager of Slack, having taken operational charge in December 2025.
Rob Seaman is an experienced enterprise cloud product leader who previously served as Chief Product Officer at Slack and senior executive at Salesforce, leading the rollout of Slackbot AI and Agentforce integrations.
Stewart Butterfield co-founded Tiny Speck in 2009 and served as CEO of Slack until December 2022. Having previously co-founded photo-sharing pioneer Flickr (sold to Yahoo), Butterfield's obsession with product design, humor, and empathy shaped Slack into a $27.7 billion cultural phenomenon.
Lidiane Jones, a former Microsoft and Salesforce executive, succeeded Stewart Butterfield as CEO in December 2022. She guided the initial integration of generative AI into Slack before departing in November 2023 to become CEO of dating app Bumble.
Denise Dresser, a veteran Salesforce sales executive, served as CEO of Slack from November 2023 until December 2025, driving enterprise adoption and monetization before leaving to join OpenAI as Chief Revenue Officer.
Cal Henderson co-founded Slack and served as Chief Technology Officer (CTO) for over a decade. Henderson architected Slack's distributed backend infrastructure, real-time messaging engine, and webhooks platform before departing in early 2024.
Tamar Yehoshua, a former Google Vice President, served as Slack's Chief Product Officer from 2019 to 2022, overseeing the launch of Slack Connect, Huddles, Canvas, and key enterprise collaboration features.
Allen Shim served as Slack's Chief Financial Officer from 2018 to 2021, orchestrating its 2019 NYSE direct listing, navigating private venture funding rounds, and helping negotiate the $27.7 billion Salesforce acquisition.
As Salesforce Chair and CEO, Marc Benioff champions Slack as the central engagement interface across all Salesforce clouds, actively guiding product strategy and positioning Slack as the conversational command center for Agentforce.
The leadership turnover reflected executive transitions common after massive tech acquisitions, alongside high market demand for top software talent from emerging AI leaders like OpenAI and consumer tech giants.
Stewart Butterfield was named one of Time Magazine's 100 Most Influential People, Wall Street Journal's Technology Innovator of the Year, and one of Vanity Fair's New Establishment titans.
Seaman is focused on establishing Slack as the premier enterprise conversational interface for autonomous AI agents, expanding open MCP connectivity, and defending enterprise seat market share against Microsoft Teams.
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