Seth Rosenberg is a Greylock partner who grew up in Winnipeg around gritty family-business entrepreneurs, shaping his focus on ambitious founders from non-traditional backgrounds rather than typical Silicon Valley archetypes. He specializes in AI + fintech with an 80% domain / 20% AI framework, looking for companies where most value comes from the underlying fintech business with AI as an accelerant, and runs a hands-on model where he works with only a few founders per year as a thought partner from the pre-idea stage. Seth Rosenberg is a Greylock partner who grew up in Winnipeg around gritty family-business entrepreneurs, shaping his focus on ambitious founders from non-traditional backgrounds rather than typical Silicon Valley archetypes. He specializes in AI + fintech with an 80% domain / 20% AI framework, looking for companies where most value comes from the underlying fintech business with AI as an accelerant, and runs a hands-on model where he works with only a few founders per year as a thought partner from the pre-idea stage.