A Team Committed to Male Reproductive Health

Trak is designed and built by Sandstone Diagnostics.

See How We’re Changing Men’s Health

About the Trak Team

We are a team of scientists, engineers, software developers, and business professionals. More importantly, we are fathers, mothers, brothers, sisters, and friends who care deeply about improving men’s reproductive health and helping people start their family.

Founded in 2012 in part by government scientists from Sandia National Laboratories. Sandstone’s mission is to provide innovative, data-driven tools to help men assess, manage, and improve their reproductive health.

Who We Are

Karen Drexler, Sandstone Diagnostics CEO

Karen Drexler

Greg Sommer, Sandstone Diagnostics Founder & CSO

Greg Sommer
Founder and CSO

Ulrich Schaff, Sandstone Diagnostics Founder & CTO

Ulrich Schaff
Founder and CTO

Sara Naab, Sandstone Diagnostics Founder & Trak Coach

Sara Naab
Founder and Trak Head Coach

Paul Manners, Sandstone Diagnostics CFO

Paul Manners

Marc Rosenstock, Sandstone Diagnostics VP of Marketing

Marc Rosenstock
VP of Marketing

Clinical and Scientific Advisors

Michael Eisenberg, MD, Sandstone Diagnostics Chief Medical Officer

Michael Eisenberg, MD
Director of Reproductive Medicine, Stanford University Medical Center

Jamin Brahmbhatt, MD
Co-Director, PUR Clinic; Co-Founder, Drive for Men’s Health

Joseph Alukal, MD
Clinical Associate Professor, NYU Langone Health Department of Urology

Douglas Carrell, PhD, HCLD
Professor of Surgery, Human Genetics, and ObGyn


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