I am Mercus Hoffmann. I run Synapsis Coffee out of a home lab in Portland, Oregon, and I write every guide on this site.
My background is neuroscience: an MS from UC Davis, then several years in biotech studying how caffeine acts on the brain. Coffee was the hobby that would not stay a hobby. At some point the two collapsed into one question that I am still chasing: why does the same bag of beans produce a great cup on Tuesday and a flat one on Wednesday? The answer is almost never mysterious. It is temperature, grind, time, ratio, and how carefully you held them steady.
What this site is
Synapsis Coffee is a reference, not a magazine. Each guide starts from a measurement and ends with numbers you can reproduce on your own gear. Where a claim comes from published research, I say so. Where it comes from my own kitchen, I say that too, and I tell you what I tested it on.
How I work
- Every brewing claim is tested at a stated temperature, grind setting, dose, and time. If I cannot state those, I do not publish the claim.
- Equipment is named. A grind size means nothing without the grinder it came from, so I tell you the model I used.
- Caffeine and health content is separated from opinion. Metabolism figures come from published work, not from what worked for me.
- When I am uncertain, the guide says so rather than rounding uncertainty into false confidence.
What this site is not
It is not gatekeeping. I have pulled good shots on cheap equipment and bad shots on expensive equipment, and the guides here cover both ends of the budget. It is also not medical advice: the caffeine research I cite describes populations, not you specifically.
Reach me
Corrections are welcome and I act on them. If a number here does not reproduce on your setup, I want to know: use the contact form, and tell me your gear and your measurements.