The Quadrilateral
Substack newsletter · by Geoff Shackelford · English
A year-round newsletter from one of golf’s last independent voices devoted to all things Grand Slam and the best Cup events.
- Audience
- 17K subscribers
- Shown publicly on Substack
- Publishing
- Every two weeks
- 5 posts indexed in the last 90 days
- Last post
- Oct 12, 2026
- 17 days ago
- Likely audience
- Golf enthusiasts
- Inferred from post content
The Quadrilateral is a Substack newsletter by Geoff Shackelford covering Golf tournaments, Major championships and PGA Tour. NewsletterFIT indexed 5 posts from it in the last 90 days, most recently on Oct 12, 2026. Shown publicly on Substack: 17K subscribers. Sponsors detected in recent posts include Dunhill.
Topics
- Golf tournaments
- Major championships
- PGA Tour
- Sports journalism
- LIV Golf
Recent posts
- Forrest Wins…
- Major(s) News…
- Meronk Wins…
- Major(s) News…
- Lessons From…
Sponsors detected
- Dunhill 1 post · last Oct 4, 2026
Detected automatically from posts marked as sponsored. Detection can miss or misread placements.
See the full picture on The Quadrilateral
Subscriber momentum over time, every detected sponsor with the source post, companies and people it mentions, guests, and an alert when any of it changes.
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Compiled from public pages · refreshed Oct 12, 2026 · How NewsletterFIT collects and labels data