i didn't know jef well. i met him at wiscon and saw him at think galacticons. we were on a panel together once. he was so darned smart. he was so darned young. it seems unbelievable and yet, there it is.
there's a gofundme for his funeral expenses and medical bills if you knew him and want to help out a bit:
https://www.gofundme.com/bkrardz8 to all of you who loved him, may his memory be a blessing.