Brian Halligan is a former HubSpot co-founder and CEO who now invests at Propeller VC while teaching his scaling frameworks—including his MSPOT method and concepts like trust battery and glue people—to scaleup CEOs navigating the transition from startup to multi-billion dollar outcomes. He deliberately pivoted from SaaS to climate tech investing, co-founding Propeller to focus specifically on ocean-related solutions while building structured founder education programs like the Ocean MBA that combine scientific partnerships with startup expertise. Brian Halligan is a former HubSpot co-founder and CEO who now invests at Propeller VC while teaching his scaling frameworks—including his MSPOT method and concepts like trust battery and glue people—to scaleup CEOs navigating the transition from startup to multi-billion dollar outcomes. He deliberately pivoted from SaaS to climate tech investing, co-founding Propeller to focus specifically on ocean-related solutions while building structured founder education programs like the Ocean MBA that combine scientific partnerships with startup expertise.