serialist

1. not comparableentertainmentOf, pertaining to, or employing serialism.

plural serialists

1. entertainmentA practitioner or adherent of serialism, an approach to composing which emphasizes the use of a series of notes, especially scales, to achieve coherence.

   In the last decade or so, this once unabashedly complex serialist, now 68, seems to have allowed a lyrical generosity into his works.

   2007 January 16, Anthony Tommasini, “Serious German Violinist Gets a Rock Star Ovation”, in New York Times

2. criminologyA serial offender; usually a serial killer, but may also include a serial rapist or serial arsonist depending on the context.
3. A writer or creator of serials; someone who creates a work that is published in installments.