In strongly correlated electron materials, the electronic, spin, and charge degrees of freedom are closely intertwined. This often leads to the stabilization of emergent orders that are highly sensitive to external physical stimuli promising opportunities for technological applications. This is exemplified in the perovskite ruthenates, where this sensitivity manifests in dramatic changes of the physical properties with subtle structural details of the RuO6 octahedra, stabilizing enigmatic correlated ground states, from a hotly debated superconducting state via electronic nematicity and metamagnetic quantum criticality to ferromagnetism. I will discuss how the rotation of the RuO6 octahedra in the surface layer of Sr2RuO4 generates new emergent orders not observed in the bulk material.[1] Through atomic-scale spectroscopic characterization of the low-energy electronic states, we can identify four van Hove singularities in the vicinity of the Fermi energy which we can link to intertwined nematic and checkerboard charge order. Tuning of one of these van Hove singularities by magnetic field suggests that the surface layer undergoes a Lifshitz transition at a magnetic field of ≈32T. The understanding of the quasi-particle interference of Sr2RuO4 [2] can be transferred to members of the RuddlesdenPopper series with higher n. I will show that in Sr3Ru2O7 the surface undergoes a magneticfield tuned Lifshitz transition [3], and how we can control the surface electronic structure structure of Sr3Ru2O7 through vector magnetic fields. [1] Carolina A. Marques, Luke C. Rhodes, Rosalba Fittipaldi, Veronica Granata, Chi Ming Yim, Renato Buzio, Andrea Gerbi, Antonio Vecchione, Andreas W. Rost, Peter Wahl; Magnetic-field tunable intertwined checkerboard charge order and nematicity in the surface layer of Sr2RuO4, Adv. Mat. 33, 2100593 (2021). [2] A. Kreisel, C. A. Marques, L. C. Rhodes, X. Kong, T. Berlijn, R. Fittipaldi, V. Granata, A. Vecchione, P. Wahl, P.J. Hirschfeld; Quasiparticle Interference of the van-Hove singularity in Sr2RuO4, npj Quantum Materials 7, 20 (2021). [3] Carolina A. Marques, Luke C. Rhodes, Izidor Benedičič, Masahiro Naritsuka, Aaron B. Naden, Zhiwei Li, Alexander C. Komarek, Andrew P. Mackenzie, and Peter Wahl; Atomic-scale imaging of emergent order at a magnetic-field-induced Lifshitz transition, arxiv/2202.12351, accepted in Sci. Adv