Specialists

Solo by design. Never alone.

There’s no shortage of know-it-alls and grifters on the internet claiming expertise in everything. Open X and it’s non-stop AI threads promising to take down whole industries. The real specialists are usually too busy doing the work.

Converge Studio is a solo practice — you get one operator, one point of view, one person accountable. But product work has edges: pricing psychology, technical due diligence, design systems, go-to-market repositioning. Sometimes the sharpest move is bringing in someone who’s spent a career on exactly that.

When that’s the right call, I pull from a network built over fifteen years. Sometimes it’s a five-minute gut check. When it’s more, they partner under my engagement with your sign-off, billed separately.

Specialists directory

Role
Where
Mark Bissell Strategist

Mark Bissell

Executive Coach | Fractional Exec

Mark works with high-performing leaders at inflection points — navigating growth, reinvention, or the pressure to deliver under intense expectations. Whether it's a rising star taking on a new role, a CEO scaling a portfolio company, a previously successful leader contemplating what's next, or an executive redefining leadership at midlife, Mark helps them find clarity, lead with conviction, and move forward with purpose.

East Coast
Ashley Branch Designer

Ashley Branch

Staff Product Designer

Visionary Designer. Built design systems for startups through mid-sized businesses to publicly traded companies. Incredibly versatile. Always ready for the challenge.

East Coast
Cubby Brendle AI/ML

Cubby Brendle

AI/ML Engineer

Cubby is the guy you go to when you have an incredibly hard problem to solve. He's your X-factor capable of unlocking value and potential you didn't even know you had.

West Coast
Ella Strategist

Ella

Emotional Support

What Ella lacks in terms of distributed systems architecture and scalable product data model knowledge, she makes up for in seeking hugs and acrobatic ball catches. Unlike the spots in our Hero banner, Ella's spots show no signs of converging.

NYC Area
Joe Essenfeld Strategist

Joe Essenfeld

CEO / Founder

Founder and serial entrepreneur. Always building, always selling, always making an impact.

NYC Area
Dan Harcsztark AI/ML

Dan Harcsztark

Engineering Leader

Tech-obsessed founder and experienced engineering leader with a track record of delivering high-impact large-scale projects. Extremely passionate about developing innovative software focused on detail and quality. Deep understanding of software architecture, distributed systems, data platforms, and cloud infrastructure. Comfortable coaching engineers and diving into code, architecture, and ops.

NYC Area
Matteo Hernandez Product Manager

Matteo Hernandez

Sr. Principal Product Manager

A savant at recognizing patterns and distilling them down into first principles where they can be turned into actionable requirements and ultimately realize that it's beautiful software that gets great outcomes for its users.

NYC Area
Kevin Lee Product Manager

Kevin Lee

Sr Principle Product Manager

Product Manager and Entrepreneur. Master when it comes to finding out what users need, constructing a vision and then coordinating with engineering, design, and other stakeholders to make magic happen.

NYC Area
Eddie Lempenski Strategist

Eddie Lempenski

Employer Brand Director

Extensive experience in brand management, graphic design, digital marketing, social media, UX, web analytics, digital video production, partnerships and media buying. A creative and effective leader with a proven record of successful global digital marketing campaigns, leading to increased brand awareness, web traffic, ROI and a larger, more engaged social media community. Recognized for delivering innovative desktop and mobile applications for a Fortune 500 employer, across a global audience.

NYC Area
Brandon Siu Designer

Brandon Siu

Senior Product Designer

Senior product designer based in New York with 6+ years of experience crafting end-to-end product and visual design solutions for startups and Fortune 500 companies alike. From redefining smart home experiences to streamlining restaurant operations, I design products that are thoughtful, engaging, and user-centric.

NYC Area
David Small Engineer

David Small

Head of Technology

Dave Small is a long-time software engineer who has lead teams to build large, high-concurrency, distributed applications across many verticals. His leadership style involves getting his hands dirty alongside his colleagues. Part of the "dirty-hands" approach means he has experience across a range of languages (Python, Java, ...), database solutions (relational, No SQL, and column store), cloud providers (AWS, GCP, and Azure), and LLMs (OpenAI, AzureAI, Gemini, and Anthropic). He looks forward to building the next big thing.

NYC Area
Carrie Streed Engineer

Carrie Streed

Senior Software Engineer → UX Engineer

Senior Frontend Engineer with nearly a decade building high-impact applications for millions of users while leading technical teams through complex transformations.

West Coast

Rules of Engagement

The rules of engagement.

01

You never hire them directly.

Specialists work under the Convergence engagement. I scope the need, I recommend who fits, I stay accountable for the outcome. You have one relationship — with me.

02

Their time is billed separately.

Specialist hours are not included in your retainer. They're billed at the specialist's rate, with no markup, and only after you approve the scope and budget up front.

03

Nobody joins without your sign-off.

Before any specialist sees your data or sits in your meetings, we agree on what they're doing, for how long, and what it costs. No surprises.

Get in touch

Have a specialist-shaped problem?

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