Phospho Team

Located on the Fitzsimons Life Science Campus in Aurora, Colorado, we are a dedicated, friendly, hard working team of scientists, committed to providing you with the highest quality antibodies and customer support in the business.

Dr. Michael Browning - Founder

Mike Browning, Ph.D. was born in Dallas, Texas and attended the University of Texas where he received a bachelor’s degree in English Literature. He then spent 5 years trying to become a filmmaker in Los Angeles and he sold shoes to pay his bills. He became very interested in how the brain processed visual images and abandoned filmmaking to start graduate school in Neurobiology in 1974. He received a Ph.D. in Neurobiology from the University of California at Irvine in 1979. He subsequently did a postdoctoral fellowship at Yale and Rockefeller University from 1980 to 1986 with Dr. Paul Greengard who won the Nobel Prize in 2002.

Dr. Browning is the founder of PhosphoSolutions, LLC. He is internationally known for his studies of protein phosphorylation and memory. In addition to his research and development work with PhosphoSolutions, Dr. Browning also was a professor of Neuroscience and Pharmacology at the University of Colorado Health Sciences Center (1987-2009) where he studied the biological bases of memory and how these processes are altered by aging and also by alcohol.

Dr. Browning has a wife and two grown sons. In his spare time he enjoys golf, spending time with his family, and relaxing in his hot tub.

Dr. Michael Browning

Kristin Nixon - President

Kristin is originally from Miami, Florida. She attended the University of Colorado in Boulder and graduated with a bachelor’s degree in molecular, cellular, and developmental biology. She began her career in research in Dr. Mike Browning’s neuroscience lab at CU Denver, studying molecular mechanisms of learning and memory. To aid their studies, the lab developed antibodies internally, primarily against NMDA receptors, and Kristin became responsible for antibody production. In 2001, Kristin left the university to help Dr. Browning launch PhosphoSolutions.

She enjoys cooking and all things food and drink, travel (especially relating to food and wine), and spending time with her miniature dachshund, Macy.

Kristin Nixon

Crystal Stutzke - Antibody Development Director

Crystal grew up in Idaho, at Mountain Home Air Force Base. She attended Boise State University and graduated with a bachelor’s degree in chemistry with a biochemistry emphasis. She worked at a Boise hospital in the pathology department and in a research lab at the University of Colorado Health Sciences Center. She joined the PhosphoSolutions team in 2004. She focuses her time on expanding our product catalog along with side-by-side assistance with our custom antibody service, antibody quality control, technical support for our antibodies and immunoassays.

Crystal enjoys mountain biking, ice climbing, swimming, and skiing. She has a daughter, Emmie, born in 2013, and a son, Garrett, born in 2016.

Crystal Stutzke

Amy Archuleta - Director of Scientific Marketing

Amy hails from Denver, Colorado and attended the University of Northern Colorado in Greeley, graduating with a bachelor’s degree in chemistry. She worked in research labs at both the University of Colorado in Boulder and at the University of Colorado Health Sciences Center in Denver. Amy started working for PhosphoSolutions in 2005, and now focuses on website design and maintenance, email marketing, and print marketing materials, as well as antibody production and quality control.

Her outside interests include travel, dancing, skiing, music, and hiking. In 2011, she put most of these activities on hold in favor of her new hobby: her daughter Maya. In 2013 Amy welcomed her second daughter, Zia.

Amy Archuleta

Kameron Simpson - Senior Product Manager

Kameron was born in Denver, Colorado. He attended Union College in Schenectady, New York, graduating with a bachelor’s degree in biology. Kameron started with PhosphoSolutions in 2011. In addition to antibody purification and quality control, he focuses on product management, sales analysis, customer outreach, and social media.

In his spare time he plays soccer, enjoys snowboarding, biking, and hiking and is involved with the Boys and Girls Club of Denver where he coaches children’s soccer leagues and provides after school care for children and young teenagers. Kameron welcomed his daughter Kara in 2021.

Kameron Simpson

Kelly Osborne - Customer Support / Research Associate

Kelly was born and raised near Denver, Colorado and graduated with her bachelor’s in biochemistry from Colorado School of Mines in Golden, Colorado. Kelly started with PhosphoSolutions in 2022 and spends her time with antibody purification, quality control, customer communication, fulfilling orders, and sorting through publications that cite our antibodies.

Outside of work, she loves being around her friends and family, doing anything from hiking and camping to enjoying a movie night wrapped in blankets. She has been volunteering with Special Olympics as a unified partner and coach since she was 8 years old and has loved every second of it.


More about us.

Read our blog.

What makes us different?

  1. If we attempt to make an antibody and it doesn’t work, we throw it away. We never sell an antibody that we can’t get to work in our hands.
  2. Our commitment to strict validation standards ensures a clean signal in endogenous protein and verifies phosphospecificity for relevant products.
  3. We are dedicated to reproducibility. Look for our “Pooled Serum” icon. Each antibody with this icon is purified from its own pool of serum to ensure lot-to-lot consistency.
  4. We guarantee our antibodies. If you can’t get the antibody to work in your application, we will provide a 100% refund.
  5. When making a custom antibody, we provide personalized customer support from start to finish, from peptide design, to purification, to characterization.