Jackson Christopher, founder of Tall Chair Advisor

Jackson Christopher

Mechanical Engineering, UC Berkeley · Founder, Tall Chair Advisor

Founder, Tall Chair Advisor · 6'4" · 6+ years chair research

About Jackson

I'm Jackson Christopher — 6'4", a Mechanical Engineering senior at UC Berkeley, and I spend most of my day at a desk, either working or studying. For years that meant dealing with chronic lower back pain and shoulder tension that I assumed was just part of the deal. It wasn't — the chairs I was using weren't built for someone my height.

In 2019, I started systematically researching chairs to figure out which ones actually fit tall users. That process — measuring dimensions, comparing manufacturer specs, reading hundreds of community reports, and eventually buying the Steelcase Gesture as my daily chair — turned into this site. Tall Chair Advisor exists because every major buying guide I could find was written for people between 5'6" and 5'11", and the recommendations reflected it.

Six years and 15+ chair models evaluated later, I've developed a systematic methodology for assessing chair fit for tall bodies. I own and daily-use the Steelcase Gesture — that's my hands-on testing chair. Every other chair on this site is evaluated through manufacturer specs, aggregated community data from r/OfficeChairs and r/tall, and mechanical engineering analysis of dimensional fit. I'm upfront about what I've sat in and what I haven't.

Outside of TCA, I also built PartCalc — an engineering calculator that pulls material properties directly from McMaster-Carr part links so engineers can skip the spec-hunting and run standard statics and materials calculations against the actual part they're using.

Evaluation Methodology

I evaluate chairs through two tracks depending on whether I have hands-on access:

All chairs — spec-based evaluation

  1. Dimensional verification. I cross-reference every spec that matters — seat depth, seat height range, back height, lumbar position — against manufacturer published data and independent measurements where available.
  2. Fit assessment by height bracket. My primary height is 6'4", but I evaluate fit across the 6'0"–6'7"+ range using my own proportions (femur length, torso height, sitting height) and standard anthropometric data (CDC NHANES).
  3. Community data aggregation. I cross-reference owner reports from r/OfficeChairs, r/tall, r/ergonomics, and manufacturer forums — filtering for tall-user-specific feedback on fit, durability, and comfort over time.

Steelcase Gesture — hands-on testing (my daily chair)

  1. Extended daily use. The Gesture has been my primary working chair for 2+ years, used 6–8 hours per day. My conclusions about long-term comfort are based on this sustained experience.
  2. Adjustment range testing. I've tested all Gesture adjustment mechanisms across their full range, noting where limits are reached at 6'4".
  3. Pain-point tracking. I've documented where and when discomfort develops, distinguishing between break-in discomfort and dimensional mismatch.

For chairs I don't own — including the Aeron Size C, Leap Plus, Sihoo Doro S300, and all budget options — my evaluations are based on the spec-based methodology above. I'm transparent about this distinction throughout the site.

I don't accept free chairs in exchange for positive reviews. When chairs are provided for review purposes, that's disclosed. My purchasing decisions for review inventory are my own, and editorial positions are not influenced by affiliate relationships. See the affiliate disclosure for details.

Why Tall-Specific Chair Guidance Matters

Standard ergonomic chair guidance assumes a user between 5'6" and 5'10". For anyone significantly outside that range, the recommendations break down. A chair with "excellent lumbar support" that's calibrated for a 5'9" torso will apply that support several inches below the lumbar region of a 6'4" user — creating pressure where there should be none, while leaving the actual lower back unsupported.

This isn't a minor comfort issue. Misaligned lumbar support, insufficient seat depth, and an inadequate seat height ceiling contribute to real physical problems — back pain, knee discomfort, and circulation problems — that affect productivity and health over time. The guides on this site are designed to help tall users understand these dimensional requirements and evaluate chairs against them specifically.

Articles by Jackson Christopher