Brian K. Vaughan accounted for seven of the Top 20 Author Graphic Novels in the book channel for January, according to information provided by NPD BookScan.  Congressman John Lewis was second, with three volumes in the Top 20, and Jeff Lemire was third, with two.

Check out the other Top 20 BookScan graphic novel charts from January:
January 2018 BookScan – Top 20 Adult Graphic Novels
January 2018 BookScan – Top 20 Kids Graphic Novels
January 2018 BookScan – Top 20 Manga
January 2018 BookScan – Top 20 Superhero Graphic Novels

And for the charts with the actual sales numbers from NPD BookScan, see these articles on our ICv2 Pro site:
January 2018 BookScan – Top 20 Adult Graphic Novels with Actual Sales
January 2018 BookScan – Top 20 Author Graphic Novels with Actual Sales
January 2018 BookScan – Top 20 Kids Graphic Novels with Actual Sales
January 2018 BookScan – Top 20 Manga with Actual Sales
January 2018 BookScan – Top 20 Superhero Graphic Novels with Actual Sales

NPD BookScan Top 20 ‘Author’ Graphic Novels - January 2018 (12/31/17 - 1/28/18)

Rank

Title

Author

Publisher

1

SAGA VOL. 8

BRIAN K. VAUGHAN

IMAGE COMICS

2

EVERYONE'S A ALIEBN WHEN UR A ALIEBN TOO: A BOOK HC

JOMNY SUN

HARPER PERENNIAL

3

FUN HOME: A FAMILY TRAGICOMIC

ALISON BECHDEL

MARINER BOOKS

4

GOING INTO TOWN: A LOVE LETTER HC

ROZ CHAST

BLOOMSBURY UK

5

MARCH: BOOK ONE

JOHN LEWIS

TOP SHELF

6

MY FAVORITE THING IS MONSTERS

EMIL FERRIS

FANTAGRAPHICS BOOKS

7

SAGA VOL. 7

BRIAN K. VAUGHAN

IMAGE COMICS

8

THE WICKED + THE DIVINE VOL. 6

KIERON GILLEN

IMAGE COMICS

9

THE WALKING DEAD VOL. 28

ROBERT KIRKMAN

IMAGE COMICS

10

SAGA VOL. 1

BRIAN K. VAUGHAN

IMAGE COMICS

11

MARCH (TRILOGY SLIPCASE SET)

JOHN LEWIS

TOP SHELF

12

DESCENDER VOLUME 5: RISE OF TH

JEFF LEMIRE

IMAGE COMICS

13

MY LESBIAN EXPERIENCE WITH LON

KABI NAGATA

SEVEN SEAS ENT.

14

BLACK HAMMER VOL. 2

JEFF LEMIRE

DARK HORSE BOOKS

15

PAPER GIRLS VOL. 1

BRIAN K. VAUGHAN

IMAGE COMICS

16

SAGA VOL.

BRIAN K. VAUGHAN

IMAGE COMICS

17

PRINCE VALIANT VOL. 16: 1967-1968 HC

HAL FOSTER

FANTAGRAPHICS BOOKS

18

MARCH: BOOK TWO

JOHN LEWIS

TOP SHELF

19

SAGA VOL. 3

BRIAN K. VAUGHAN

IMAGE COMICS

20

SAGA VOL. 6

BRIAN K. VAUGHAN

IMAGE COMICS

Source: The NPD Group/BookScan

NPD Bookscan collects weekly point-of-sale data on print books from over 16,000 locations including e-tailers, chains, mass merchandisers, independent bookstores, and more.  NPD Bookscan covers approximately 85% of the U.S. trade print book market.  The ranks on this chart are based on piece sales. Some publishers classify titles that are primarily text, or art books, as graphic novels; we've removed those titles from the ranking above.

For past BookScan Top 20 Graphic Novel lists, see the "BookScan Top 20 GN Index."