Meet Our Team

Outpatient Care Team

Kenneth Caldwell, MD Hematology / Oncology

Dr. Caldwell specializes in pediatric hematology-oncology in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. He joined the hospital staff in 2021. Dr. Caldwell earned his medical degree from the University of Florida College of Medicine in Gainesville, Florida. He completed a pediatric residency from Boston Combined Residency Program at Boston Children’s Hospital/Boston Medical Center. He then completed a pediatric fellowship in hematology-oncology from St. Jude Children’s Research Hospital in Memphis, Tennessee.
View Kenneth’s Bio

Jennifer Dean, MD Hematology / Oncology

Dr. Dean is a hematologist-oncologist in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. She joined the hospital staff in 2021. She was previously an attending physician with Pediatric Specialists of Virginia in the Center for Cancer and Blood Disorders and with Children’s National Hospital.
View Jennifer’s Bio

Jennifer Mayer, MD Hematology / Oncology

Dr. Mayer specializes in pediatric hematology/oncology in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute and is the lead hematologist of the Vascular Anomalies Program at the hospital. She served 21 years as medical director of Johns Hopkins All Children’s collaboration with Sarasota Memorial Hospital. She is author of more than 30 publications and two textbook chapters. She joined Johns Hopkins All Children's in 1996 and received the hospital's Best Consulting Physician Award in the 2017 Johns Hopkins Medicine Clinical Excellence Awards.
View Jennifer’s Bio

Peter Shaw, MD Hematology / Oncology

Dr. Shaw is hematologist-oncologist who serves as medical director of Tampa Services for the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. He joined the medical staff in August 2016 as deputy director. Dr. Shaw treats a variety of patients with blood and cancer disorders at the Tampa clinic and is recognized nationally as a leader in the areas of adolescent and young adult (AYA) oncology. He is founding member of the Consortium of Adolescent and Young Adult Cancer Centers and helped develop internationally recognized standards for care of this population. He is expanding the AYA program at Johns Hopkins All Children’s to enhance continuity of care into adulthood through multidisciplinary collaboration with physicians at Moffitt Cancer Center. He also supports the institute’s fertility preservation program, which helps pediatric cancer and bone marrow transplant survivors enjoy optimal health and the opportunity to become parents in their adult years.
View Peter’s Bio

Theresa Torres, APRN

Theresa Torres, APRN

Theresa Torres is an advanced practice registered nurse in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. She specializes in outpatient pediatric hematology/oncology. She joined the hospital staff in 2019. Before joining our hospital, Torres worked as a nurse practitioner in hematology/oncology at Children's Mercy Hospital in Kansas City, Missouri where she assisted in the development of a Spanish speaking hematology/oncology clinic and research program. Torres earned her Bachelor of Science in Nursing from Saint Luke's College of Health Sciences in Kansas City, Missouri, followed by a Master of Science in Nursing from the University of Missouri.


Lauren Gray, APRN

Lauren Gray, APRN

Lauren Gray is an advanced practice registered nurse in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. She specializes in pediatric hematology/oncology. She joined the hospital staff in 2016. Before joining our hospital, Gray worked as a blood and bone marrow transplant nurse at Moffitt Cancer Center in Tampa, Florida. Gray earned her Associate of Science in Nursing and Bachelor of Science in Nursing from St. Petersburg College, followed by a Master of Science in Nursing from the University of South Florida.


C. Isaac Hauk, PA

C. Isaac Hauk, PA

Isaac Hauk is an advanced practice provider in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. He joined the hospital staff in 2008. Hauk specializes in outpatient and inpatient pediatric hematology/oncology and is the manager and hiring manager of advanced practice providers. Hauk earned his Master of Physician Assistant degree from the University of Florida, College of Medicine in Gainesville, Florida.


Meagan Szarkowski, RN

Meagan Szarkowski, RN



AnneMarie Allushuski, RN

AnneMarie Allushuski, RN

AnneMarie Allushuski is a registered nurse in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. She specializes in pediatric hematology/oncology. She joined the hospital staff in 2018. Allushuski earned her Bachelor of Science in Nursing from Rasmussen College of Nursing in Land O’ Lakes, Florida.

Inpatient Care Team

Nanette Grana, MD Hematology / Oncology

Dr. Grana specializes in pediatric hematology/oncology in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. She joined the hospital medical staff in 1992. Dr. Grana earned her medical degree from the University of Puerto Rico School of Medicine. She trained in pediatrics at University Children’s Hospital in San Juan, Puerto Rico, and completed a pediatric hematology/oncology fellowship at the University of Florida.
View Nanette’s Bio

Britni Hill, MD Hematology / Oncology

Dr. Hill specializes in caring for hospitalized children in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. She started on the hospital staff in 2014, joining the hematology/oncology team in 2017.
View Britni’s Bio

Daniel Ortiz, MD Hematology / Oncology

Dr. Ortiz specializes in pediatric hematology-oncology in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. He joined the hospital staff in 2018.
View Daniel’s Bio

Rebecca Berger, APRN

Rebecca Berger, APRN

Rebecca Berger is an advanced practice registered nurse in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. She specializes in inpatient pediatric hematology/oncology. She joined the hospital staff in 2016. Before joining our hospital, Berger worked as a clinical nurse in the hematology/oncology units at Florida Hospital for Children in Orlando, Florida. Berger earned her Bachelor of Science in Nursing and Master of Science in Nursing from the University of Pennsylvania School of Nursing in Philadelphia, Pennsylvania.


Patti Michalski, APRN

Patti Michalski, APRN



Jamie Jennings, APRN

Jamie Jennings, APRN

Jamie Jennings is an advanced practice registered nurse in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. She specializes in inpatient pediatric hematology/oncology. She joined the hospital staff in 2020. Before joining our hospital, Jennings worked as a clinical nurse in the hematology/oncology units at Dayton Children’s Hospital in Dayton, Ohio. Jennings earned her Bachelor of Science in Nursing at Indiana Wesleyan University in Marion, Indiana, followed by a Master of Science in Nursing at Wright State University in Dayton, Ohio.


Melanie Haase, APRN

Melanie Haase, APRN



Fallon Lanham, PA-C

Fallon Lanham, PA-C

Fallon Lanham is a certified physician assistant in the Johns Hopkins All Children’s Cancer & Blood Disorders Institute. She specializes in inpatient pediatric hematology/oncology. She joined the hospital staff in 2017. Lanham earned her Bachelor of Science from the University of South Florida in Tampa, Florida, followed by a Master of Science in Physician Assistant Studies from South University in Tampa.


Brooke Wiggins, PA-C

Brooke Wiggins, PA-C


Supportive Care Team

Melissa Faith, PhD Psychiatry / Psychology

Dr. Faith is a clinical pediatric psychologist specializing in hematology/oncology at Johns Hopkins All Children’s Hospital. She received her master’s and doctorate degrees in clinical psychology from the University of Arkansas, completed a predoctoral internship in clinical child psychology at the University of Mississippi Medical Center and completed a postdoctoral fellowship in clinical psychology with an emphasis in pediatric hematology and oncology at the University of Oklahoma Health Sciences Center. Dr. Faith’s research interests include disseminating evidence-based interventions in large medical and community centers (e.g., motivational interviewing) as well as emotion socialization, social adjustment, and sibling adjustment during and following childhood chronic illness. 
View Melissa’s Bio

Megan Armstrong, RD, LD

Megan Armstrong, RD, LD Dietitian



Tara Hudson, CCLS

Tara Hudson, CCLS Child Life Specialist



Amanda Memken, Pharm.D, B.C.P.S., B.C.P.P.S.

Amanda Memken, Pharm.D, B.C.P.S., B.C.P.P.S. Chemopharmacy



Jessica White, Pharm.D, B.C.P.P.S.

Jessica White, Pharm.D, B.C.P.P.S. Chemopharmacy



Caroline Taylor, Pharm.D, B.C.P.S.

Caroline Taylor, Pharm.D, B.C.P.S. Chemopharmacy



JT Fannin, Pharm.D

JT Fannin, Pharm.D Chemopharmacy