4x founder

Will Dennis

Co-Founder at Hammock | Building the only HSA/FSA for wellness | Previously at WeightWatchers | a16z SR006 | a16z speedrun Scout

Co-founder

Hammock· Speedrun 006 🇺🇸 New York, New York, United States

in LinkedIn

2026a16z speedrun Scout· Andreessen Horowitz

Founder · since 2011

Company

Andreessen Horowitz

Role

a16z speedrun Scout

current

Stage

—

no public source

Raised

—

no public source

Based

—

Founder / co-founder — the company's markEmployee / research role

Source: LinkedIn work history

Profile coverage5 of 7 · missing posts, contact

Hammock

The only HSA/FSA agent that saves you money. 2x founder ($50M ARR, $50M raised) and VP of Product @ Weight Watchers

Speedrun 006

Experience

Career

Hammock
Co-founder
Cofounder · 2025 – Present
2025
Andreessen Horowitz
a16z speedrun Scout · 2026 – Present
2026
Will Dennis Consulting
Founder
Founder, AI Product, Engineer · New York City · 2024 – 2025
2024
WW / WeightWatchers
VP of Product · 2022 – 2024
2022
WhatsApp
Product Manager · 2020 – 2022
2020
Will Dennis Consulting
Product Management, Design & UX Consultant · 2016 – 2020
2016
Stride
Principal Product Management Consultant · 2020
2020
Houseparty (Life on Air.)
Head of Product · Tel Aviv Area, Israel · 2015 – 2016
2015
Hollerback
Co-founder
Co-Founder · San Francisco · 2013 – 2015
2013
Spinlister
Co-founder
Co-Founder · San Francisco · 2011 – 2013
2011

Bio

Before Hammock, Will was VP of Product at WeightWatchers (NASDAQ: WW) leading the $1B ARR consumer subscription and telehealth business. Prior to WeightWatchers, Will was a product leader at WhatsApp and HouseParty, and a 2x founder.