In this talk I will discuss recent work on numerically solving for the binary black hole dynamics of black holes in Einstein scal ar Gauss-Bonnet (ESGB) gravity. This modified gravity theory can be motiva ted by effective field theory reasoning\, and admits scalarized black hole solutions. These two facts make it a promising theory to constrain using binary black hole\, gravitational wave observations. I will discuss how re cent advances in mathematical relativity--in particular\, the development of the "\;modified harmonic formulation"\;--have opened up the pos sibility of constructing fully nonlinear solutions to the equations of mot ion of ESGB gravity (in addition to a class of scalar-tensor modified theo ries known as "\;Horndeski"\; theories). I will discuss numerical simulations of single and binary black hole systems in these theories\, an d the gravitational and scalar radiation they emit.\n DTSTART:20210208T180000Z LOCATION:Online\, Room Zoom SUMMARY:The classical evolution of binary black hole systems in scalar-tens or theories END:VEVENT END:VCALENDAR