David Chen

Mobile Accessibility Researcher

MS Human-Computer Interaction, CMU BS Computer Science, UC San Diego 8 years mobile UX research Seattle, WA

Background

David's career started in academic accessibility research at Carnegie Mellon's Human-Computer Interaction Institute, where his master's thesis looked at how visual contrast and tap-target size affect smartphone usability for adults over sixty-five. After graduating, he joined the accessibility team at a Fortune-500 device manufacturer in the Pacific Northwest, where for three years he ran in-home usability sessions with older adults learning to use the company's flagship phones. That work informed several of the accessibility features that ship by default on those devices today.

David left the manufacturer in 2023 to consult independently on accessibility for mobile applications. He joined opcionrural.com as a contributor in 2024 and as a regular editor in early 2025. He writes the guides that touch on safety, security, and buying decisions — the areas where his combination of research background and bedside-manner experience comes in most useful.

Areas he writes about

Choosing between iPhone and Android based on accessibility needs, not brand loyalty.
Scam recognition — calls, texts, emails, and the newer "courier" and "grandchild emergency" schemes.
Passwords, two-factor authentication, and biometric unlock — when each is right and when each can backfire.
Emergency features: Emergency SOS, Fall Detection, Medical ID, and what they actually do.
What to do when a phone is lost or stolen.
Safer use of online banking apps and bill-pay.
Ride-share and grocery-delivery apps that are reasonable for first-time users.

How he works

David's research background shapes how he writes. Every safety guide is structured around the specific decisions a reader has to make under stress — when a scam call is on the line, when a phone is missing, when an email looks suspicious. He drafts in flowchart form first, then turns the flowchart into prose. The result is guides that take you from "something is wrong" to "I know what to do next" in two or three minutes.

Editorial principles

Don't catastrophise. Most scams have one or two obvious red flags. Listing eighty doesn't help.
The phone is the answer more often than not. Many readers can avoid handing their device to a stranger or driving to a shop just by knowing one feature already on the phone.
Treat fear as a fact. Older adults are not "irrational" about technology. They've often been the target of real fraud. Take that seriously.
Make instructions one-screen. If a safety step takes more than one screen to read, the reader will give up.

Conflicts of interest

David previously worked for a device manufacturer whose products he occasionally discusses. He recused himself from writing about that manufacturer's phones for the first eighteen months after leaving and continues to disclose the prior relationship in any guide that mentions them. He does not own stock in any phone manufacturer, telecom carrier, or app publisher mentioned on opcionrural.com.

Verify his credentials

David welcomes credential verification. The institutions named in his credentials can confirm his education and employment directly:

MS Human-Computer Interaction — Carnegie Mellon: degree confirmation via the Human-Computer Interaction Institute at hcii.cmu.edu, or the CMU registrar at cmu.edu/hub.
BS Computer Science — UC San Diego: degree confirmation via the UC San Diego registrar at registrar.ucsd.edu.
Direct verification: journalists, fact-checkers, and prospective collaborators may write to hello@opcionrural.com for credential confirmation; we reply within two business days.

Contact

David can be reached through our general contact page, which routes to hello@opcionrural.com.