In both cases sentences remain correct,though you should add 'the' before 'author'. K. Rowling.
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CalifJimThere is no need to make the main verb past just because one of the relative clauses makes use of a past tense.
The man who wrote The Castle is Kafka.
The wallet which was lost yesterday is now on the kitchen table.
The events which led to the Civil War are X, Y, and Z.
The woman who spoke to us yesterday writes for the New Yor