John P. Leonard
Experienced in IgG4-Related Disease

Dr. John P. Leonard

Hematology Oncology | Oncology | Hematology
Weill Cornell Medicine
Weill Medical College Of Cornell
520 E 70th St, Suite 651, 
New York, NY 
Offers Telehealth
30 Years of Experience

Experienced in IgG4-Related Disease
Weill Cornell Medicine
Weill Medical College Of Cornell
520 E 70th St, Suite 651, 
New York, NY 
OverviewInsuranceLocationsClinical ResearchSimilar Doctors

Overview

John Leonard is a Hematologist Oncology specialist and an Oncologist in New York, New York. Dr. Leonard has been practicing medicine for over 30 years and is rated as an Experienced provider by MediFind in the treatment of IgG4-Related Disease. His top areas of expertise are Non-Hodgkin Lymphoma, Follicular Lymphoma, Mantle Cell Lymphoma (MCL), Diffuse Large B-Cell Lymphoma (DLBCL), and Bone Marrow Transplant.

His clinical research consists of co-authoring 233 peer reviewed articles and participating in 3 clinical trials. MediFind looks at clinical research from the past 15 years.

Specialties
Hematology Oncology
Oncology
Hematology
Licenses
Internal Medicine in NY
Hospital Affiliations
New York-Presbyterian Hospital
Nyu Langone Hospitals
Languages Spoken
English
Gender
Male

Insurance

Accepted insurance can change. Please verify directly with the provider.

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Accepted insurance plans:

Aetna
  • EPO
  • HMO
  • POS
  • PPO
Humana
  • HMO
  • INDEMNITY
  • POS
  • PPO
Medicaid
  • OTHER MEDICAID
  • STATE MEDICAID
UnitedHealthcare
  • EPO
  • HMO
  • POS
  • PPO

Locations

WEILL MEDICAL COLLEGE OF CORNELL
520 E 70th St, Suite 651, New York, NY 10021
Call: 212-746-6575
Other Locations
NEW YORK UNIVERSITY
111 Broadway, New York, NY 10006
Call: 212-263-9700
NEW YORK UNIVERSITY
240 E 38th St, New York, NY 10016
Call: 212-263-7300

Clinical Research

Clinical research consists of overseeing clinical studies of patients undergoing new treatments and therapies, and publishing articles in peer reviewed medical journals. Providers who actively participate in clinical research are generally at the forefront of the fields and aware of the most up-to-date advances in treatments for their patients.


3 Clinical Trials

A Phase III, Randomized Study of Nivolumab (Opdivo) Plus AVD or Brentuximab Vedotin (Adcetris) Plus AVD in Patients (Age >/= 12 Years) With Newly Diagnosed Advanced Stage Classical Hodgkin Lymphoma
A Phase III, Randomized Study of Nivolumab (Opdivo) Plus AVD or Brentuximab Vedotin (Adcetris) Plus AVD in Patients (Age >/= 12 Years) With Newly Diagnosed Advanced Stage Classical Hodgkin Lymphoma
Enrollment Status: Active_not_recruiting
Publish Date: October 15, 2025
Intervention Type: Drug, Biological, Procedure, Other, Radiation
Study Drugs: Brentuximab, Dacarbazine, Doxorubicin, Filgrastim, Nivolumab, Pegfilgrastim, Vinblastine
Study Phase: Phase 3
ILyAD (Indolent Lymphoma And Vitamin D) A Phase III Double Blind, Randomized Trial to Evaluate the Effect of Vitamin D on Progression-free Survival in Patients With Low Tumor-burden Indolent Non-Hodgkin Lymphoma Treated With Rituximab
ILyAD (Indolent Lymphoma And Vitamin D) A Phase III Double Blind, Randomized Trial to Evaluate the Effect of Vitamin D on Progression-free Survival in Patients With Low Tumor-burden Indolent Non-Hodgkin Lymphoma Treated With Rituximab
Enrollment Status: Completed
Publish Date: September 04, 2024
Intervention Type: Other, Dietary supplement, Biological
Study Drugs: Cholecalciferol, Rituximab
Study Phase: Phase 3
A Phase 1 Study of AG-636 in the Treatment of Subjects With Advanced Lymphoma
A Phase 1 Study of AG-636 in the Treatment of Subjects With Advanced Lymphoma
Enrollment Status: Terminated
Publish Date: August 25, 2020
Intervention Type: Drug
Study Phase: Phase 1
View 2 Less Clinical Trials

233 Total Publications

Outcomes of relapsed/refractory peripheral T-cell lymphoma in the modern era: impact of stem cell transplant and novel agents.
Outcomes of relapsed/refractory peripheral T-cell lymphoma in the modern era: impact of stem cell transplant and novel agents.
Journal: Leukemia & lymphoma
Published: August 14, 2025
View All 233 Publications
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VIEW MORE IGG4-RELATED DISEASE DOCTORS

Areas of Expertise

MediFind evaluates expertise by pulling from factors such as number of articles a doctor has published in medical journals, participation in clinical trials, speaking at industry conferences, prescribing and referral patterns, and strength of connections with other experts in their field.

Learn more about MediFind’s expert tiers

Find Dr. Leonard's expertise for a condition
ConditionClose
  • Elite
  • B-Cell Lymphoma
    Dr. Leonard is
    Elite
    . Learn about B-Cell Lymphoma.
    See more B-Cell Lymphoma experts
  • Diffuse Large B-Cell Lymphoma (DLBCL)
    Dr. Leonard is
    Elite
    . Learn about Diffuse Large B-Cell Lymphoma (DLBCL).
    See more Diffuse Large B-Cell Lymphoma (DLBCL) experts
  • Follicular Lymphoma
    Dr. Leonard is
    Elite
    . Learn about Follicular Lymphoma.
    See more Follicular Lymphoma experts
  • Mantle Cell Lymphoma (MCL)
    Dr. Leonard is
    Elite
    . Learn about Mantle Cell Lymphoma (MCL).
    See more Mantle Cell Lymphoma (MCL) experts
  • Non-Hodgkin Lymphoma
    Dr. Leonard is
    Elite
    . Learn about Non-Hodgkin Lymphoma.
    See more Non-Hodgkin Lymphoma experts
  • Distinguished
  • Chronic B-Cell Leukemia (CBCL)
    Dr. Leonard is
    Distinguished
    . Learn about Chronic B-Cell Leukemia (CBCL).
    See more Chronic B-Cell Leukemia (CBCL) experts
  • Chronic Lymphocytic Leukemia (CLL)
    Dr. Leonard is
    Distinguished
    . Learn about Chronic Lymphocytic Leukemia (CLL).
    See more Chronic Lymphocytic Leukemia (CLL) experts
  • Gastric Lymphoma
    Dr. Leonard is
    Distinguished
    . Learn about Gastric Lymphoma.
    See more Gastric Lymphoma experts
  • Hodgkin Lymphoma
    Dr. Leonard is
    Distinguished
    . Learn about Hodgkin Lymphoma.
    See more Hodgkin Lymphoma experts
  • Lymphofollicular Hyperplasia
    Dr. Leonard is
    Distinguished
    . Learn about Lymphofollicular Hyperplasia.
    See more Lymphofollicular Hyperplasia experts
  • Marginal Zone Lymphoma (MZL)
    Dr. Leonard is
    Distinguished
    . Learn about Marginal Zone Lymphoma (MZL).
    See more Marginal Zone Lymphoma (MZL) experts
View All 9 Distinguished Conditions
  • Advanced
  • Agranulocytosis
    Dr. Leonard is
    Advanced
    . Learn about Agranulocytosis.
    See more Agranulocytosis experts
  • Anaplastic Large Cell Lymphoma
    Dr. Leonard is
    Advanced
    . Learn about Anaplastic Large Cell Lymphoma.
    See more Anaplastic Large Cell Lymphoma experts
  • Bone Marrow Transplant
    Dr. Leonard is
    Advanced
    . Learn about Bone Marrow Transplant.
    See more Bone Marrow Transplant experts
  • Classical Hodgkin Lymphoma
    Dr. Leonard is
    Advanced
    . Learn about Classical Hodgkin Lymphoma.
    See more Classical Hodgkin Lymphoma experts
  • Febrile Neutropenia
    Dr. Leonard is
    Advanced
    . Learn about Febrile Neutropenia.
    See more Febrile Neutropenia experts
  • Large-Cell Immunoblastic Lymphoma
    Dr. Leonard is
    Advanced
    . Learn about Large-Cell Immunoblastic Lymphoma.
    See more Large-Cell Immunoblastic Lymphoma experts
View All 11 Advanced Conditions
  • Experienced
  • Acute Myeloid Leukemia (AML)
    Dr. Leonard is
    Experienced
    . Learn about Acute Myeloid Leukemia (AML).
    See more Acute Myeloid Leukemia (AML) experts
  • Adult T-Cell Leukemia
    Dr. Leonard is
    Experienced
    . Learn about Adult T-Cell Leukemia.
    See more Adult T-Cell Leukemia experts
  • Chronic Familial Neutropenia
    Dr. Leonard is
    Experienced
    . Learn about Chronic Familial Neutropenia.
    See more Chronic Familial Neutropenia experts
  • Chronic T-Cell Leukemia (CTCL)
    Dr. Leonard is
    Experienced
    . Learn about Chronic T-Cell Leukemia (CTCL).
    See more Chronic T-Cell Leukemia (CTCL) experts
  • Gaucher Disease
    Dr. Leonard is
    Experienced
    . Learn about Gaucher Disease.
    See more Gaucher Disease experts
  • IgG4-Related Disease
    Dr. Leonard is
    Experienced
    . Learn about IgG4-Related Disease.
    See more IgG4-Related Disease experts
View All 21 Experienced Conditions
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