 In a series of articles beginning in 1963 with A "Poisson Formula for Semi-Simple Lie Groups", he continued to establish himself as a ground-breaking thinker.His work showing that the behavior of random walks on a group is intricately related to the structure of the group - which led to what is now called the Furstenberg boundary – has been hugely influential in the study of lattices and Lie groups.In his 1967 paper, "Disjointness in ergodic theory, minimal sets, and a problem in Diophantine approximation", Furstenberg introduced the notion of ‘disjointness,’ a notion in ergodic systems that is analogous to coprimality for integers.