Apollo.io Names Mark Sieglock Chief Product Officer

Aug 26, 2026
Apollo.io has appointed Mark Sieglock as Chief Product Officer. He will lead product strategy, design, research, and engineering as the company builds its AI GTM system.

Apollo.io has appointed Mark Sieglock as Chief Product Officer. Sieglock will lead product strategy, design, research, and engineering as the company builds its AI GTM system for revenue teams.

Sieglock was an early product executive at eero, where he helped take the company from before its first product launch in 2016 through its acquisition by Amazon in 2019. Apollo.io stated that his role will include work on systems that connect customer data, outreach, marketing, pipeline management, website activity, meetings, and other revenue workflows.

The company said its platform is used by more than 600,000 customers. Sieglock is the latest executive hire under CEO Matt Curl, following the appointment of Phil Moon as Chief Financial Officer in May.

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