Principal Investigator
Warren Grayson, PhD
Dr. Warren Grayson is a Professor and the Vice-Chair for Faculty Affairs in the Department of Biomedical Engineering at Johns Hopkins University. Prior to joining the faculty at Johns Hopkins, he did his post-doctoral training at Columbia University and PhD at Florida State University in Biomedical Engineering. He obtained his B.Sc. in Chemical & Process Engineering at The University of the West Indies, Trinidad.
His research interests focus on the stem cell- and biomaterial-based regeneration of craniofacial bone and skeletal muscle. He is a pioneer in the field of 3D-printing porous, biodegradable scaffolds, and bioreactor design for personalized, craniofacial bone regeneration. His work on engineering anatomically shaped bone grafts received coverage in the New York Times, BBC, and Science Translational Medicine among others, and has spawned a start-up company. His lab has published over 100 peer-reviewed papers and book chapters and he has given over 100 talks nationally and internationally.
He has been recognized by the Maryland Academy of Sciences with the Allan C. Davis Medal for the Outstanding Young Engineer. He has also received the Career Development Award from the Orthopaedic Research Society, the Career Enhancement Award from the American Society for Bone and Mineral Research, the Young Investigator Award from the Tissue Engineering and Regenerative Medicine International Society, and the prestigious Early Faculty CAREER Award from the National Science Foundation. He was elected as a fellow of the American Institute for Medical and Biomedical Engineering and recognized by the National Academy of Medicine as an Emerging Leaders in Health and Medicine. In 2021 he was named a Daniel Nathans Scientific Innovator by the Johns Hopkins School of Medicine.
- PhD, Biomedical Engineering, Florida State University (2005)
- BS, Chemical & Process Engineering, University of the West Indies (1998)
- Email: [email protected]
Lab Manager
Ernesto Lippert Lozano
I joined the lab in the Fall of 2019 as an undergraduate at Johns Hopkins University studying biomedical engineering with a focus in translational cell and tissue engineering. My undergraduate work was focused on developing polymeric microtanks for oxygen delivery in tissue engineered bone scaffolds. After earning my Bachelor's degree and transitioning to graduate studies, I began working on an independent research project focused on developing novel preservation strategies for the improved survival of vascularized composite allografts (VCA). I earned my Master's degree in the Spring of 2023, after which I took on the role of Lab Manager. In addition to managing day-to-day lab functions, I also assist with ongoing projects and publications.
Outside of the lab, I am a musician, outdoor enthusiast, and home cook. When I'm not in the lab or working on personal projects, I'm usually out with friends or relaxing at home with my cat.
- MSE, Biomedical Engineering, Johns Hopkins University (2023)
- BS, Biomedical Engineering, Johns Hopkins University (2022)
- Email: [email protected]
Resident Physician
LeeAnn Li
I graduated from the University of Virginia in 2013 with a B.S. in biomedical engineering. Thereafter, I worked at the National Institutes of Health (NIH) as an IRTA Scholar before entering the UCLA-Caltech Medical Scientist Training Program (MSTP; MD-PhD) in 2014. In 2020, I earned my PhD in Bioengineering with Dr. Song Li (no relation), focusing on cell engineering for sciatic nerve injury and other neuromuscular applications and both central and peripheral neural reprogramming. I graduated medical school in 2022, then entered residency at Johns Hopkins. I seek to engineer in vitro human neuromuscular models (e.g., “tissues-on-a-chip”) that can be used to study disease- and patient- specific pathophysiology and therapeutics.
Outside of work, I enjoy being active outdoors, gardening, yoga, indoor climbing, exploring new places, and dabbling in the arts.
- Resident Physician, Adult Neurology, Johns Hopkins (~2026)
- Intern Physician, Internal Medicine, Johns Hopkins Bayview (2023)
- MD, PhD Bioengineering, University of California, Los Angeles (2022, 2020)
- BS, Biomedical Engineering, University of Virginia (2013)
- Email: [email protected]
Resident Physician
Tiffany Toni
I received my B.S. in Honors Biochemistry with a Science, Technology, and Values Minor from the University of Notre Dame. I then attended the University of Chicago for medical school, during which I spent one year at the NIH investigating head and neck cancer therapeutics. I am currently in an R25 research track Otolaryngology-Head and Neck Surgery residency program at Johns Hopkins University. I joined the Grayson lab in the summer of 2025. My research interest is primarily in head and neck reconstruction with a focus on bone regeneration.
Outside of work, I enjoy spending time with my family, running, hiking, and traveling.
- Resident Physician, Otolaryngology-Head and Neck surgery, Johns Hopkins University (~2029)
- MD, University of Chicago Pritzker School of Medicine (2023)
- BS, Honors Biochemistry, University of Notre Dame (2018)
- Email: [email protected]
PhD Student
Eszter Mihaly
I graduated from UC Berkeley with my bachelors in Bioengineering, and started my PhD in Biomedical Engineering at Johns Hopkins soon after in 2019. The focus of my project is promoting neuromuscular regeneration after large-scale muscle injury using tissue engineered scaffolds. I'm interested in how exercise and pro-neuroregenerative factors can be harnessed to promote healing in injuries that cause prolonged deficits in the lives of patients.
In my free time, you can usually find me rock climbing, running, and whenever possible, social dancing (swing and salsa are my favorite). When I'm at home, I love to cook and share new dishes with my friends, and care for my growing collection of succulents and potted plants.
- PhD Student, Biomedical Engineering, Johns Hopkins University (~2025)
- BS, Biomedical Engineering, University of California, Berkeley (2017)
- Email: [email protected]
PhD Student
Allison Horenberg
After graduating from the University of Virginia in 2020 with a degree in Biomedical Engineering and Mathematics, I started my PhD in BME in Fall of 2020. My research interests involve understanding how the in vivo microenvironment affects bone regeneration and how endogenous cell types interact with implanted stem cells to encourage or inhibit bone formation. Outside of lab, I love working out (occasionally enjoying running), watching sports, cooking, and trying new restaurants. Originally from Silver Spring, Maryland, I am a huge Baltimore Ravens and UVA basketball fan and can usually be found watching Sportscenter on the weekends.
- PhD Student, Biomedical Engineering, Johns Hopkins University (~2025)
- BS, Biomedical Engineering, University of Virginia (2020)
- Email: [email protected]
PhD Student
Shaquielle Dias
In 2019, I earned my medical degree at the University of the West Indies in Jamaica. Following three years of medical practice and research, I will start my PhD in Biomedical Engineering in Summer 2022. My research interests encompass the interactions between regenerated skeletal muscle and host nervous system.
Outside the lab, I enjoy cooking, hiking, and lounging on a beach. I am always up for an adventure and enjoy road trips.
- PhD Student, Biomedical Engineering, Johns Hopkins University (~2027)
- MBBS, University of the West Indies, Jamaica (2019)
- Email: [email protected]
PhD Student
Tram Nguyen
I started my PhD in Materials Science Engineering in June 2023, coavised by Dr Tim Weihs and Dr Warren Grayson. I received a BS in Biomedical Engineering and a BA in Economics from the University of Rochester in May 2022, and a MSE in Materials Science Engineering in May 2023. My research focuses on translation of technology from lab to industry, specifically on scale-up and GMP-like manufacturing as well as development of materials for our biodegradable scaffolds for enhanced cranial facial bone healing.
Outside the lab, I love cooking, baking and playing Ultimate Frisbee.
- PhD Student, Biomedical Engineering, Johns Hopkins University (~2027)
- MSE, Materials Science Engineering, Johns Hopkins University (2023)
- BS, Biomedical Engineering, University of Rochester (2022)
- BA, Economics, University of Rochester (2022)
- Email: [email protected]
PhD Student
Carlos Villapudua
In 2019, I earned my B.S degree in Chemistry with a Minor in Biology at the University of La Verne. After, I spent 3 years as a post-bacc in the Matrix and Morphogenesis Lab at the Dental and Craniofacial Research Institute at the NIH before coming to the BME program at Johns Hopkins. My research interest lie at the intersection of coupling computational techniques (Single Cell Transcriptomics and other -OMICS technology) with experimental techinques to accelerate development of models for accelerated research.
Beyond research I like to relax by being pretty active and being outside. I like to do hiking, tennis, soccer, and especially weight lifting.
- PhD Student, Biomedical Engineering, Johns Hopkins University (~2027)
- BS, Chemistry with a Minor in Biology, University of La Verne (2019)
- Email: [email protected]
PhD Student
Dominic Davis
I completed my B.S. in Chemical Engineering at Howard University in 2023, and I began my PhD the following summer. After rotating, I joined Dr. Grayson’s lab in the summer of 2024. My current research interests are at the intersection of material design and skeletal muscle regeneration, for optimized skeletal muscle repair.
Outside of the lab, I enjoy cooking and playing games online with friends.
- PhD Student, Biomedical Engineering, Johns Hopkins University (~2028)
- BS, Chemical Engineering, Howard University (2023)
- Email: [email protected]
Masters Student
Shashank Bagaria
I began working in the Grayson Lab in October 2024, where my primary focus is the design and development of a custom coaxial extrusion 3D printer. This platform was built from the ground up to enable fabrication of core–shell scaffolds with precisely controlled architectures, opening new opportunities for bone tissue engineering research. Through this work, I aim to demonstrate how engineering innovation at the hardware level can unlock translational advances in regenerative medicine.
More broadly, I am interested in applying biomanufacturing and advanced fabrication tools to bridge the gap between laboratory-scale discoveries and clinically relevant therapies. My long-term goal is to contribute to scaffold technologies that improve healing outcomes in complex bone defects.
Outside the lab, I enjoy astronomy, astrobiology and soccer.
- MSc Student, Biotechnology, Johns Hopkins University (~2026)
- BTech, Biotechnology, Vellore Institute of Technology (2024)
- Email: [email protected]
Masters Student
Xuanli Liu
I received my B.S. in Biomedical Engineering from the Chinese University of Hong Kong, Shenzhen in 2024. That fall, I began my master’s studies in the Grayson Lab at Johns Hopkins University. My research interests lie in the role of physical stimulation in muscle regeneration and the development of in vitro neuromuscular junction models.
Outside the lab, I enjoy hiking, cooking, playing badminton, and watching sports — especially soccer and Formula 1. I’m excited to be part of the Hopkins community and look forward to the journey ahead.
- MSE Student, Biomedical Engineering, Johns Hopkins University (~2026)
- BS, Biomedical Engineering, Chinese University of Hong Kong, Shenzhen (2024)
- Email: [email protected]
Undergraduate Student
Eileen Su
I am a Biomedical Engineering student in the Class of 2026 from Ann Arbor, MI, interested in Translational Cell and Tissue Engineering regarding regenerative medicine for volumetric muscle loss.
Outside of school and lab, I love exploring new restaurants and trails, cooking, and simply relaxing at home with my cat.
- BS Student, Biomedical Engineering, Johns Hopkins University (2026)
- Email: [email protected]
Undergraduate Student
Sydney Kanuga
I am from the Philadelphia area and am currently pursuing both bachelor’s and master’s degrees at Johns Hopkins University for Materials Science and Engineering with a concentration in biomaterials. I joined the Grayson lab in August 2023 and my work is principally focused on the material characterization of materials used in our biodegradable bone scaffolds.
In my free time, I enjoy solving jigsaw puzzles, watching football, swimming, and binging crime mysteries with my cat, Whiskers.
- MSE Student, Materials Science and Engineering, Johns Hopkins University (2026)
- BS Student, Materials Science and Engineering, Johns Hopkins University (2026)
- Email: [email protected]
Undergraduate Student
Eric Zeng
I am a Biomedical Engineering Student from the class of 2027 and joined the lab in Spring 2024. My research is primarily focused on improving growth factor tethering to biodegradable scaffolds to promote regeneration in critical-sized bone defects.
In my free time I like watching sports, gaming, and making and solving crosswords.
- BS Student, Biomedical Engineering, Johns Hopkins University (2027)
- Email: [email protected]
Undergraduate Student
Annabelle Wang
I am a Chemical and Biomolecular Engineering student in the class of 2027 from Seattle, WA. I joined the lab in Spring 2025 and I currently focus on regeneration of tissue following volumetric muscle loss.
Outside of lab, I enjoy swimming, dancing ballet and traditional Chinese dance, and exploring the East Coast.
- BS Student, Chemical and Biomolecular Engineering, Johns Hopkins University (2027)
- BS Student, Molecular and Cellular Biology, Johns Hopkins University (2027)
- Email: [email protected]
Lab Alumni
Postdocs
- Naboneeta Sarkar
- Maryam Rahmati
- Yuxiao Zhou
- Dennis Lambrechts
- Pegah Abbasnia
- Pinar Yilgor Huri
- Nalinkanth Ghone
PhD Students
- Dallas Altamirano
- Yunke (Claudia) Ren
- Sara Salehi
- Srujan (Sami) Singh
- Alexandra Rindone
- Ashley Farris
- Sarah Somers
- Jordana Gilbert-Honick
- Justin Morrissette-McAlmon
- Ethan Nyberg
- Ben Hung
- Daphne Hutton
Masters Students
- Jingtong (Erica) Zhao
- Kenny Tran
- Carolyn Ton
- Colin Cook
- Erin Salter
- Shishira Nagesh