Spanish Translation of quien

quien

1. who
   los jefes, quienes estaban ausentes, tenían la información necesaria the managers, who were absent, had the necessary information
2. whom
   la chica de quien hablo se llama Isabel the girl of whom I am speaking is named Elizabeth
3. whoever, he or she who
   quien mal anda mal acaba whoever lies down with dogs gets up with fleas

quién

1. who
   ¿quién es ese chico? who is that boy?
2. whom
   no sé de quién hablas I do not know of whom you are speaking