Mark Louka is an Executive Director in Systematic Equity Trading at JP Morgan Asset Management. His twin brother Rob Louka is Head of Trading for the Quantitative Equity Group at Vanguard. In this episode, Jesse discusses with Mark and Rob their impact on each other's careers and characters, culminating in each holding senior posts in systematic trading at two of the world's largest asset managers. They also discuss market liquidity dynamics, innovating in large organizations, machine learning, culture, market design, and the importance of diversity to build empathy.