Sean Macmannis Email & Phone Number

San Francisco, Ca, Us

San Francisco, Ca, Us

I help you build a layoff-proof life & a career on your terms. ⛰️

San Francisco, Ca, Us

Positive Sum Marketing is a consultancy for early stage venture-backed startups & DAOs. We work exclusively with entrepreneurs & early-stage organizations that empower builders & creators. Our vision is a stronger, healthier internet owned & governed by all of us. What it's like working with us:- Our passion is building powerful products & businesses that solve major pain points, at global scale.- We help to articulate what your best customers look like, what their needs are, and partner with you to design and iterate on a product that meets their needs.

District is an exclusive membership community for the world’s top founders, investors and c-level operators.

As Head of Marketing, I ideated and spearheaded the creation of Radworks in early 2023, developed and executed a comprehensive marketing strategy positioning Radworks as a leading advocate for internet freedom and created content that drove channel growth and ecosystem adoption. Radworks is building a sovereign developer stack for the open source software ecosystem.

San Francisco, Us

I was the first dedicated product marketer at Clubhouse, working directly with the product team & the GM of Monetization to launch Clubhouse's first paid offering using blockchain.

Boulder, Co, Us

I built and led Gitcoin's marketing team through a period of rapid growth & decentralization. In retrospect, these were the heyday of Gitcoin Grants, distributing $20M+ to builders around the world. My team's responsibilities included community, content, product marketing, PR, growth, marketing ops, events, and brand. With a $1.9M annual budget, 100k+ social media followers, 10k+ funders & 1k+ quarterly grantees, Gitcoin's marketing footprint & impact was among the largest and most successful of all DAOs in 2022.

Piedmont, California, Us

I ideated and founded Collective Knowing, a community-first wellness startup producing live, transformative events in meditation and mindfulness. Abandoned and went full-time in blockchain & web3.

San Francisco, California, Us

I led go-to-market, product marketing and sales enablement for Pinterest's targeting and ad quality products globally, driving 4x revenue growth to $1B+ in just under three years.

I led adtech sales and marketing consulting projects for startups, financial consulting firms, and hedge funds.

San Francisco, California, Us

I drove the company's product transformation from static ad retargeting to a full-funnel performance advertising platform, growing the business to 50k+ customers with $100M+ in annual revenue.

Sunnyvale, Ca, Us

At Dapper, I oversaw engagement + account strategy for half our client base, including Kayak + Orbitz. After Yahoo! acquired Dapper in 2010, I integrated the dynamic ad solution into the Yahoo! display ads marketplace team, then worked on subsequent acquisitions/integrations of 5to1 & Interclick.

San Bruno, Ca, Us

I owned the post-contract client relationships & revenue for 10+ clients building vertical display advertising networks. Achieved highest client renewal rate amongst all AMs. Adify was acquired by Cox Enterprises for $300M in 2008.

Master Of Business Administration (M.B.A.)

Bachelor’S Degree, History