Aaron Szekel

Aaron currently invests, advises, and consults for many start-ups that focus on Future of Work, Healthcare, and Media.

Aaron was the first business operations hire at Flatiron Health, a cancer technology company that sold to Roche for $2B in 2018, where he was the Director of Special Projects, Operations, and Finance. During his time at Flatiron, and through its acquisition, Aaron built the Finance, HR, Legal, Sales Ops, Operations, and Corporate Development teams. He was instrumental in buying and integrating Altos Solutions (oncology EMR), fundraising for Series A and B, and running cross-functional special projects with the product, engineering, sales, and operations teams.

Prior to Flatiron, Aaron was at First Round Capital where he managed a team that consulted for and incubated over 75 First Round community companies. The team focused on assisting Founders with go-to-market strategy, building unit-economic financial models, introducing early employees, and accelerating customer development. Aaron also supported investment decisions through diligence, launched Dorm Room Fund, and assisted with venture operations.

Prior to First Round, Aaron spent time in media, including working as an Associate on the CBS Corporate Development team, a Product Marketer at Simulmedia, and an Analyst at the Salter Group. In these roles, he was heavily involved with strategic planning, the $1.8B acquisition of CNET, the sale of Elvis Presley’s music library, and the valuation of film and television content. Aaron earned an MBA from the Wharton School at the University of Pennsylvania, an undergraduate degree with High Honors from Brandeis University, and a certificate from the London School of Economics.

Content & Articles by Aaron Szekel

Setting Up A Founder-Led Organic LinkedIn Content Machine With Claude

In this Mucker Growth Series session, we invited Jonathan Martinez, founder and CEO of GrowthPair, to share how founder-led LinkedIn content took his startup from zero to $1M in annual...

Lessons From Building An AI-Native Startup with Octagos

In this Mucker Growth Series session, we invited friends from one of our portfolio companies Haley Chute, CPO & CMO, and Harpreet Marwaha, COO & CFO of Octagos, to share...

How To Craft Your Website Messaging & Positioning as a Startup

In this Mucker Growth Series session, Anthony Pierri, co-founder of FletchPMM, walks through how to craft website messaging and positioning as a startup. FletchPMM is a consultancy that has worked...

2026 New York Tech Week Recap of Mucker Sessions

Mucker Capital went to New York Tech Week to host sessions for founders, operators, and builders thinking through how AI is changing product, growth, and search. Among the sessions were:...

Closing Enterprise Deals in Founder-Led Sales as a Startup

In our recent Mucker Growth Series session, I invited David Mackay, Managing Director at D9Y and one of our operating experts at Mucker, to talk about closing enterprise deals in...

The 10 Security Gaps That Plague Startups Before Their A Round

A NOTE ON SEVERITY Not every item on this list carries the same level of risk. Some are the kind of finding that stops a deal. Others are serious but...

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