John Markus

Career overview

Role: Meticulous television and film archivist.
Task: Write a 180-260 word career overview of John Markus (focusing on Writing).
Constraints:
Use ONLY verifiable facts from provided sources.
No invented titles, names, dates, awards, ratings, etc.
Original, neutral, encyclopedic prose.
Plain text only (no markdown, no asterisks, no headings, no bullet points).
Length: 180-260 words.
Structure: 2-3 short paragraphs.
No preamble or JSON.
[1] TMDB: John Markus is known for writing. Has 7 known credits. Also known as John Marcus.
[2] TMDB: Known as Writer, Actor, Creator, Producer, and Teleplay. Work includes The Cosby Show, Taxi, The Larry Sanders Show, and The Facts.
[3] TV Guide: Mentions full list of movies/TV shows exists.
[4] IMDb: Producer for The Cosby Show. Known for The Cosby Show (1984), The Larry Sanders Show (1992), and Kristin (2001).
[5] Personal Site: Worked on Paramount's Taxi. Joined original writing staff of The Cosby Show. Moved to New York for production. Promoted to Supervising Producer after the first six episodes. Returned for second season as co-executive producer and show runner.
Paragraph 1: Early career and Taxi/Cosby Show.
John Markus is a writer, actor, creator, producer, and teleplay professional. His career includes work on the Paramount production Taxi. Following an assignment on Taxi, Markus joined the original writing staff of The Cosby Show. This role required him to move to New York, where the series was produced. During his tenure on The Cosby Show, he was promoted to supervising producer after the completion of the first six episodes. He later returned for the second season of the series in the capacity of co-executive producer and show runner.
Paragraph 2: Other credits and known works.
In addition to his work on The Cosby Show, which is noted in records from 1984, Markus is recognized for his involvement with The Larry Sanders Show, which is noted from 1992, and Kristin, which is noted from 2001. His professional credits also include The Facts. According to database records, he has seven known credits. He is also sometimes identified by the name John Marcus.
Drafting attempt 1:
John Markus is a professional known for his work as a writer, actor, creator, producer, and in teleplay. His career includes an assignment on the Paramount production Taxi. Following this work, Markus joined the original writing staff of The Cosby Show and moved to New York for the show's production. After the first six episodes of The Cosby Show, he was promoted to the role of supervising producer. He subsequently returned for the second season of the series to serve as co-executive producer and show runner.

Markus is also recognized for his contributions to other television productions. His known credits include The Larry Sanders Show, Kristin, and The Facts. Database information lists his involvement with The Cosby Show starting in 1984, The Larry Sanders Show in 1992, and Kristin in 2001. He has seven known credits in total and is also known by the name John Marcus.
Word Count Check:
Draft 1 is approximately 155 words. I need to expand to reach the 180-260 range without inventing facts.
Expansion Strategy:
Elaborate on the specific roles and the sequence of events mentioned in the sources.
Drafting attempt 2:
John Markus is a professional known for his work as a writer, actor, creator, producer, and in teleplay. His career includes an assignment on the Paramount production Taxi. Following this assignment, Markus joined the original writing staff