function author_query( $query ) {
    if ( $query->is_author()
        && $query->is_main_query() ) {
            $query->set( 'category__not_in', array( 2, 3, 30 ) );
    }
}
add_action( 'pre_get_posts', 'author_query' );

function jetpack_is_settings( $args ) {
    if ( is_array( $args ) )
        $args['render'] = 'author_query';
    return $args;
}
add_filter( 'infinite_scroll_settings', 'jetpack_is_settings');