From Big Pharma to Nature: How a Merck Chemist Became a Designer of Natural Medicines

Tim Chernak spent almost two decades at Merck developing targeted therapies for cancer, HIV and diabetes that hit the disease without harming healthy cells. His work helped thousands of patients. But in 2018, already an established chemist, he made an unexpected move: he left big pharma and immersed himself in nature.

From the Big Pharma lab to the forest

After twenty years of synthetic chemistry, building molecules "from scratch" for corporate pipelines, Chernak reached a key conclusion: nature had already invented the most interesting molecules. Plants, fungi, microorganisms: millions of years of evolution have produced chemical compounds that work flawlessly inside living systems. Instead of drawing an ideal molecule on a computer from theoretical models, he chose a different path: learning from evolution.

His approach is bio-inspired design (biomimicry): studying the molecular structures of living organisms, understanding how they work, and applying that knowledge to drug development.

Why nature turned out to be the better strategy

Over a hundred years, synthetic pharmacology has produced marvels. But it has run into a fundamental challenge: even the most precisely engineered molecules sometimes cause unexpected side effects, because the body is not an isolated system but a complex network of interactions.

Natural compounds work differently. They evolved inside living organisms, and compatibility is built into their structure at the level of molecular biology.

• Millions of years of natural selection have weeded out toxic combinations
• Natural molecules are often less allergenic and better tolerated
• The planet's biodiversity is a library of millions of molecules ready to be studied
• Modern AI makes it possible to analyze natural components at a scale that was previously impossible

But natural does not always mean effective. This is where Chernak's experience came in. His years in precision medicine taught him how to take a natural molecule and refine it, making it more selective and potent.

A new specialty for a new era

Chernak's story reflects a shift in pharmacology. The 20th century was the era of synthetic chemistry; the 21st looks like the era of the "natural designer": a specialist who combines ecology, molecular biology, AI and pharmacology. This is not simply a biologist or simply a chemist. It is a hybrid professional who speaks the language of nature and translates it into the language of medicine. Such specialists will become critical for the next generation of drugs.

What this means

For the industry, it is a return to its historical roots with modern tools. For young scientists, it is a signal of a new career path. Nature offers an open laboratory where expertise is valued just as highly, but the meaning of the work aligns with sustainability.