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Lawrence F. Brass, MD, PhD Researcher

Professor of Pharmacology Professor of Medicine

Dr. Brass is employed by Penn Medicine.

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Clinical Specialties


  • Hematology

Programs & Centers:

  • Heart and Vascular Research

Board Certification:

  • Hematology, 1982
  • Internal Medicine, 1979
  • Medical Oncology, 1981

Insurance Accepted

  • Aetna US Healthcare
  • Amerihealth Caritas
  • Amerihealth Caritas Medicare
  • Cigna
  • Cigna HealthSpring
  • Clover Health Plan
  • CVS Health
  • Devon Health Services (Americare)
  • eLAP Services
  • Gateway Health Plan
  • Geisinger Health Plan
  • HealthAmerica / HealthAssurance, a Coventry Plan
  • HealthPartners
  • HealthPartners Medicare
  • HealthSmart
  • Highmark Blue Shield
  • Homestead Smart Health Plans
  • Horizon Blue Cross Blue Shield of New Jersey
  • Humana / Choicecare
  • Independence Blue Cross (Keystone East)
  • Intergroup
  • Keystone First
  • Keystone First Medicare
  • Multiplan
  • NJ Medicaid
  • NJ Qualcare
  • Oxford Health Plan
  • PA Health and Wellness (Centene) Medicare
  • PA Medicaid
  • PA Medicare
  • Preferred Health Care/LGH
  • Provider Partners Health Plan
  • Rail Road Medicare / Palmetto GBA
  • Remedy Partners at Penn Medicine
  • Tricare
  • United Healthcare
  • UnitedHealthcare Community Plan
  • US Family Health Plan
  • Veterans Choice Program

Education and Training

Residency: University Hospitals of Cleveland
Medical School: Case Western Reserve University School of Medicine
Residency: Case Western Reserve University Hospital
Fellowship: Hospital of the University of Pennsylvania


American Physician Scientist Association (APSA), National American Society for Clinical Investigation, National American Society of Hematology, International Association of American Physicians (AAP), National International Society for Thrombosis and Hemostasis, International North American Society for Thrombosis and Hemostasis, National Scientific Advisory Board, Blood Center of Wisconsin, Blood Research Institute, National

Hospital Affiliation

Dr. Brass is employed by Penn Medicine.

Hospital Privileges:

  • Hospital of the University of Pennsylvania: Has privileges to treat patients in the hospital.


Description of Research Expertise:

CVI Program Unit Administrator:
Thrombosis / Hemostasis

Research Interests
mechanisms of thrombosis

Key Words: platelets, coagulation, vascular biology, signal transduction, systems biology, proteomics, transgenic mice, megakaryocytes, intravital microscopy.

Description of Research
My longstanding research and clinical interest is in platelet biology and the mechanisms of platelet activation in response to vascular injury and disease. Platelets are blood cells best known for their role in halting bleeding after vascular injury, but they do many other things as well, not all of which are healthy for humans. People that lack platelets are at risk for life-threatening bleeding. People that have platelets are at risk for the kinds of acute arterial thrombosis that leads to heart attacks and strokes, especially in the setting of atherosclerotic cardiovascular disease. Our goal is to understand the former and prevent the latter. The work we are doing focuses on human biology and pathology, but makes extensive use of genetically engineered mouse models and systems biology approaches as well. Studies currently funded by the NIH Heart, Lung and Blood Institute (NHLBI) and the American Heart Association include efforts to understand how platelet activation is initiated and regulated, how contacts between activated platelets foster thrombus growth and stability, in part by establishing a protected local environment, and how differences among platelets affect responses to injury. Methods that we employ range from the manipulation of gene expression in megakaryocytes to intravital high resolution confocal microscopy and computerized modeling. Campus collaborations include strong links to the School of Engineering and to investigators in the Departments of Medicine, Pediatrics and Pharmacology. Potential rotation and thesis projects can be identified in any of these areas.

Lab Rotation Topics
Changing all the time, so if this area of investigation sounds interesting to you, come by for a chat.

Current Laboratory Personnel:
Timothy J. Stalker, PhD - Research Assistant Professor
Peisong Ma, PhD - Senior Research Investigator
Jie Wu - Research Specialist
John Welsh - Graduate Student
Tom Colace, PhD - Postdoctoral Investigator
Sara Sampietro, PhD - Postdoctoral Investigator

Selected Publications:

Welsh John D, Stalker Timothy J, Voronov Roman, Muthard Ryan W, Tomaiuolo Maurizio, Diamond Scott L, Brass Lawrence F: A systems approach to hemostasis: 1. The interdependence of thrombus architecture and agonist movements in the gaps between platelets. Blood 124 (11): 1808-15,2014.

Tomaiuolo Maurizio, Stalker Timothy J, Welsh John D, Diamond Scott L, Sinno Talid, Brass Lawrence F: A systems approach to hemostasis: 2. Computational analysis of molecular transport in the thrombus microenvironment. Blood 124 (11): 1816-23,2014.

Stalker Timothy J, Welsh John D, Tomaiuolo Maurizio, Wu Jie, Colace Thomas V, Diamond Scott L, Brass Lawrence F: A systems approach to hemostasis: 3. Thrombus consolidation regulates intrathrombus solute transport and local thrombin activity. Blood 124 (11): 1824-31,2014.

Wannemacher K M, Jiang H, Hess P R, Shin Y, Suzuki-Inoue K, Brass L F: An expanded role for semaphorin 4D in platelets includes contact-dependent amplification of Clec-2 signaling. Journal of thrombosis and haemostasis : JTH 11 (12): 2190-3,2013.

Brass Lawrence F, Tomaiuolo Maurizio, Stalker Timothy J: Harnessing the platelet signaling network to produce an optimal hemostatic response. Hematology/oncology clinics of North America 27 (3): 381-409,2013.

Voronov Roman S, Stalker Timothy J, Brass Lawrence F, Diamond Scott L: Simulation of intrathrombus fluid and solute transport using in vivo clot structures with single platelet resolution. Annals of biomedical engineering 41 (6): 1297-307,2013.

Mou Peipei, Zeng Zhao, Li Qiang, Liu Xiaohui, Xin Xiaoran, Wannemacher Kenneth M, Ruan Changgeng, Li Renhao, Brass Lawrence F, Zhu Li: Identification of a calmodulin-binding domain in Sema4D that regulates its exodomain shedding in platelets. Blood 121 (20): 4221-30,2013.

Stalker Timothy J, Traxler Elizabeth A, Wu Jie, Wannemacher Kenneth M, Cermignano Samantha L, Voronov Roman, Diamond Scott L, Brass Lawrence F: Hierarchical organization in the hemostatic response and its relationship to the platelet-signaling network. Blood 121 (10): 1875-85,2013.

Welsh J D, Colace T V, Muthard R W, Stalker T J, Brass L F, Diamond S L: Platelet-targeting sensor reveals thrombin gradients within blood clots forming in microfluidic assays and in mouse. Journal of thrombosis and haemostasis : JTH 10 (11): 2344-53,2012.

Flamm Matthew H, Colace Thomas V, Chatterjee Manash S, Jing Huiyan, Zhou Songtao, Jaeger Daniel, Brass Lawrence F, Sinno Talid, Diamond Scott L: Multiscale prediction of patient-specific platelet function under flow. Blood 120 (1): 190-8,2012.

View all publications

Academic Contact Info

Room 815, BRB II/III
421 Curie Blvd.

Philadelphia, PA 19104
Phone: (215) 573-3540

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