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Loyal is developing drugs to extend dog lifespan; we aim to build the defining aging company. Loyal was founded in early 2020 and has raised over $50M from Khosla, First Round Capital, Collaborative Fund, Longevity Fund, Quiet Capital, BoxGroup, and more. Loyal is working on bringing to market the first drugs intended to extend lifespan (years of life) and healthspan (quality of life). We aspire to build a pharm...



  • Health

    Good health is critical to every other human (and animal!) experience. We believe health is a fundamental right and are dedicating our lives to maximizing health and developing better medicines for the worst diseases.

  • Seeking and Feedback Loops

    Uniquely in biology, there is a predetermined truth of whether a specific drug will work or not — we just have to catch up with biology! We seek out this truth and do not shy away from inconvenient truths. This holds for personal development too: we are always searching for feedback loops and embody a perpetual growth mindset.

  • Transparency

    We believe full transparency in thoughts, opinions, intentions, and actions (both good ones and mistakes) is a better way to build a business and work together.

  • Morality and Empathy

    We are developing medicines that may one day be given to a living animal, medicines that if designed badly could hurt that animal instead of help. This is a huge responsibility and should be respected as such. Our work needs to adhere to the strictest moral code and always integrate empathy for the patient.

  • Kindness

    Great business(wo)men do not need to be ruthless — you can execute excellently with kindness.

  • Dog gifs

    We love them.

Insider experiences

What is a typical day like at Loyal?

I log-on 7-8am PST/PDT and am the sharpest in the morning/early afternoon and evening. It is beneficial for me to take my dog for a walk or go to the barn to ride my horse in the afternoon, when possible. I enjoy doing IC work in the evenings and have focus-time blocked on my calendar on Tuesdays and Thursdays. I am checking Slack often and usually respond quickly. If it requires a longer discussion- feel free to throw a Zoom meeting on my calendar! I often find it easier to talk through something, and appreciate being kept in the loop and included in meetings where I may have something to learn or contribute.

What’s your favorite thing about working at Loyal?

Love that we have an amazing CEO, a great leadership team, excellent benefits, and a transparent, feedback driven culture. Best company I've ever worked for :)

What’s your favorite thing about working at Loyal?

The people here are SO smart! It's refreshing to be inside a culture that is driven to succeed, packed full of intelligence, but also endearing and approachable. Loyal puts culture first!

Celine Halioua
Founder & CEO
Karen Greenwood
Senior Vice President, Regulatory & Strategy
John Poisson
Chief Creative Officer
Stefan Leape
Chief of Staff
Ellen Ratcliff
Director of Clinical Development
Dina Juarez-Salinas
VP Preclinical Development
Claire Pickens
VP, Veterinary Operations
Stacy Ross
VP Drug Development

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