Timothy Schappe (


Tim has worked in the Fehniger Lab for over 3 years as lab manager and senior technician. He has more than 10 years of research expertise in cell biology, mouse husbandry, flow and mass cytometry, and GMP-based cellular therapy. Tim is the general contact for all lab questions.

Casssie Keppel (

Cassie returned to the Fehniger Lab in 2016 as a Senior Research Technician.  She has extensive experience in molecular and cell biology, and works on microRNAs and mouse model development.

Michelle Becker-Hapak (

Michelle has susbtantial experience in cell biology, immunology, and GMP-based cellular therapy.  She leads the NK cell production and correlative science on clinical trials in the Fehniger Lab. Outside the lab, Michelle loves hiking and travelling!

Ethan McClain (

Ethan has experience in cellular and molecular biology, and his primary focus is on NK cell modulating agents within the lab, as well as correlative immunomonitoring and NK cell therapy production.



Melissa Berrien-Elliott, PhD (

Melissa’s research projects include the study of microRNA regulation of NK cell development, mechanisms of memory-like NK cell generation, and correlative science pertaining to memory-like NK cell adoptive immunotherapy.  She works extensively on mass cytometry experimental design and data analysis methods for monitoring NK cells in vivo in patients.

Felicia Gomez, PhD (

Felicia’s project focuses on lymphoma genomics in concert with the Obi and Malachi Griffith laboratories.  She is studying recurrent mutations in follicular and Hodgkin lymphoma and their correlation with clinical outcomes.


Graduate Students

Julia Wagner ( MD/PhD Candidate

Julia’s projects in the Fehniger lab focus on both human and murine NK cells. One project involves investigating IL-15-based augmentation of human NK cell anti-tumor responses. Another focuses on transcriptional regulation of murine NK cell development and function. Outside the lab, Julia enjoys running, hiking, amateur restaurant critiquing, vinyl record hunting, and Montreal Canadiens hockey!

Undergraduate Students

Maddie Lee (

Maddie is a Junior at Washington University who is majoring in Biology. She is working on genotyping mice for the Fehniger lab, and helping out on other ongoing projects. Outside the lab, she is involved with student theater and the 2017 iGEM competition. In her free time, she likes to explore St. Louis and binge-watch Scrubs.


Amanda Cashen, MD