Philipp specialises in the public and private law of financial markets. His original focus was on the antagonistic relationship between risk and liquidity, with an emphasis on legal risk management through legal devices within financial institutions and the international compatibility of legal and regulatory regimes.
Since becoming chair of the EU Expert Group on Regulatory Obstacles to Financial Innovation in 2018, Philipp's research interest has shifted towards the systemic and societal implications of the digitalisation and datafication of the financial market, increasingly focusing on consumer welfare. This shift is driven by his insight into how consumers’ agency and autonomy are progressively limited by the merging of financial services and the data economy.