[8] Sekowsky bestowed expensive gifts on her even after his marriage to Latta,[9] causing friction in the Timely bullpen, which she left in 1949.

[9]Sekowsky, one of the nascent Marvel Comics' mainstays, chose to remain and "make George's life hell",[10] Barclay said in 2004.

[12] Sekowsky and writer Gardner Fox co-created the Justice League of America in The Brave and the Bold #28 (March 1960).

Fox and Sekowsky added to the membership of the Justice League by inducting new members Green Arrow,[15] the Atom,[16] and Hawkman.

[20] The following year's JLA team-up with the Justice Society introduced the threat of the Crime Syndicate of America of Earth-Three.

[22] Sekowsky and writer Bob Haney introduced B'wana Beast in Showcase #66 (Feb.

The following year, Sekowsky also became the writer and changed the direction of the series by having the Metal Men assume human identities.

"[25] Sekowsky wrote and drew features for the series-tryout comic-book series Showcase during the last three years of its run.

[3] He became the writer/artist of the Supergirl feature in Adventure Comics as of issue #397 (Sept. 1970) and frequently disregarded continuity by scripting stories which contradicted DC's canon.

[3] Sekowsky and writer Greg Weisman planned a Black Canary miniseries in 1984 for DC Comics.

After the first issue was pencilled, the project went unpublished due to the character being used in writer/artist Mike Grell's Green Arrow: The Longbow Hunters series.

[29] For the last decade of his life, Sekowsky lived in Los Angeles and worked primarily on Hanna-Barbera animated television series, including Scooby-Doo.

After hospitalization with health problems stemming from diabetes, he began freelancing for publisher Daerrick Gross, who was developing a line of skateboard and ninja comics.