Brian Halligan(@bhalligan):“We disagree a lot. Like, all the time.” When you're building a company, you don't need constant harmony. You need a mirror. Someone to expose your blind spots, challenge your logic, and stand up to you. And vice versa. @kalshi CEO @mansourtarek_ on his dynamic with his co-founder @luanalopeslara: “We disagree by design." The best founding teams aren't perfectly aligned. They're productively oppositional. Tag your mirror below 👇 (Full episode in the comments)

Brian Halligan

@bhalligan

Co-founder HubSpot | Sequoia | Propeller | MIT Host, Long Strange Trip pod:

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Brian Halligan@bhalligan

2026.07.20 19:14

“We disagree a lot. Like, all the time.” When you're building a company, you don't need constant harmony. You need a mirror. Someone to expose your blind spots, challenge your logic, and stand up to you. And vice versa. @kalshi CEO @mansourtarek_ on his dynamic with his co-founder @luanalopeslara: “We disagree by design." The best founding teams aren't perfectly aligned. They're productively oppositional. Tag your mirror below 👇 (Full episode in the comments)