Though the group was held together for a while by common interest, some split away. Zabolotsky seems to have had a falling out with Vvedensky. In the 1930s Kharms and Vvedensky became more closely involved with a group of friends who met semi-regularly for what they called "conversations." Yakov Druskin, a Christian philosopher and music-theorist (he wrote on Bach, Schoenberg and Webern), was a key member of this group. Druskin and his friend Leonid Lipavsky (a children's writer under the name of Leonid Savelyev, and an amateur mathematician and author of philosophical tracts) had known Alexander Vvedensky in high-school, and had become friends with Kharms and Zabolotsky as well. Lipavsky actually wrote down a number of the "conversations." Nikolay Oleynikov, an editor at the children's publishing house which had long employed the young poets of the OBERIU as writers and translators of children's literature, became part of this group by the mid-thirties.