Hamza Celik, PhD

Hamza joined the Challen Lab as a post-doctoral research fellow in December of 2013. He quickly became an integral part of the lab, mentoring countless students and peers during his seven year tenure with the lab. His research focused on the functional characterization of tumor suppressors in leukemic transformation of chronic myeloid malignancies through the use of novel mouse models that have many features of human blood diseases. In December of 2020, Hamza joined the biopharmaceutical company Incyte in Wilmington, DE.

Beth Ostrander, PhD

Beth joined the Challen Lab as a graduate research assistant after entering Washington University's graduate program in 2013. Beth’s research focused on the roles of mutated epigenetic modifiers such as Dnmt3a and Tet2 in clonal hematopoiesis and leukemogenesis. Beth earned her PhD in November 2019 and moved on to join fellow Challen Lab alum Cates Mallaney at PierianDx as a Clinical Genomics Specialist.

Andy Martens

As one of the original hires of the Challen Lab, Andy assisted Grant in building the foundation of the lab. He served as Lab Manager for seven years beginning in March of 2012 until accepting a position with the biotech company Wugen in January of 2019.

Casey Wilson, PhD

Casey joined the Challen Lab in September of 2016. His research investigated the role of epigenetic regulation in adult and pediatric T-cell Leukemia. He completed his tenure with the lab in April of 2018 before joining Arch Oncology as a Research Scientist.

Cates Mallaney, PhD

Cates joined the Challen Lab as a PhD candidate in August of 2012. Her work in the lab centered around the effects of histone modifiers in hematopoietic stem cell fate decisions and leukemogenisis. After completing her PhD in September of 2018, she accepted a position with PieranDx as a Clinical Genome Director.

Ashley Kramer

Ashley was a member of the lab from 2015 until her entrance into medical school in 2017.

Ethan Krug

Ethan joined the Challen Lab in January of 2020 after completing his BA in Film Media Studies at Washington University in St. Louis. Ethan's primary role in the lab was assisting Dr. Hamza Celik with a various projects, including developing a humanized model for myelofibrosis. Ethan was a Challen Lab member throughout 2020 until his fall admission to New York Medical College.

Alok Kothari

Alok was a member of the lab from 2013 until 2015.

Ryan Rees

Ryan was a member of the lab from 2013 until his entrance into medical school in 2015.

John Nikitas

John was a member of the lab from 2013 to 2016.