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We present and test TesseRACt, a non-parametric technique for recovering theconcentration of simulated dark matter halos using Voronoi tessellation.TesseRACt is tested on idealized N-body halos that are axisymmetric, triaxial,and contain substructure and compared to traditional least-squares fitting aswell as two non-parametric techniques that assume spherical symmetry. TesseRACtrecovers halo concentrations within 0.3% of the true value regardless ofwhether the halo is spherical, axisymmetric, or triaxial. Traditional fittingand non-parametric techniques that assume spherical symmetry can returnconcentrations that are systematically off by as much as 10% from the truevalue for non-spherical halos. TesseRACt also performs significantly betterwhen there is substructure present outside $0.5R_{200}$. Given thatcosmological halos are rarely spherical and often contain substructure, wediscuss implications for studies of halo concentration in cosmological N-bodysimulations including how choice of technique for measuring concentration mightbias scaling relations.

Voronoi Tessellation and Non-parametric Halo Concentration