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CLL Society Board of Directors

Solid, generous, grounded, experienced, compassionate, and business savvy, CLL Society’s Board of Directors fortifies CLL Society’s foundation and directs its laser focus towards actualizing our mission.

Steven Bloom - CLL Society

Steven Bloom

President & Chair

Steven Bloom is a seasoned executive with 35 years of experience across multiple health care business models. Steve started his career at Eli Lilly and Company where he worked in many senior level roles including PROZAC USA Marketing Leader and Executive Lead in Corporate Affairs, which included patient advocacy and allied development. Steve left Lilly to help start up companies Inflexxion (addiction services) and Pharmetrics (health outcomes and patient level analytics) build and scale their business models as the executive responsible for Commercial Planning, Corporate Development, and Corporate Strategy. Pharmetrics was subsequently acquired by IMS Health in 2005. Steve joined ZIOPHARM Oncology (ZIOP) as SVP of Corporate Development and Commercial Planning and led the effort to build a business in both the sarcoma and lymphoma disease areas. Steve then served as Chief Strategy Officer at VERASTEM Oncology (VSTM) where his team led the effort to acquire duvelisib, which was approved by the FDA in September 2018 for CLL and FL. Steve was the Chief Business Officer at Boston Pharmaceuticals where he helped the company with commercial and business development strategy. He currently serves as Chief Business Officer of Vincerx. Steve graduated from Northeastern University College of Pharmacy in 1984 and has been an American Cancer Society Road to Recovery driver since 2008.

Sandy Bihlmeyer - CLL Society

Sandy Bihlmeyer, MEd


Ms. Bihlmeyer received her Master of Education in Community Counseling from Ohio University in Athens, Ohio. She worked the first 13 years of her career in mental health and social services in a variety of settings and organizations including those serving victims of domestic violence, adults with mental illness, and children with varying needs. She then moved into the area of continuing medical education (CME) for primary care and family medicine healthcare providers, and has spent the last 20 years in this field. She is currently the Senior Project Manager at the National Association for Continuing Education (NACE), an accredited provider of continuing medical education. Ms. Bihlmeyer is originally from Ohio, has lived on both the east and west coasts, and is happily back in the Midwest. In her free time, she likes to cook and invent recipes, and Midwest weather allowing, she likes to garden, camp, and be outdoors.

Dr. Brian Koffman - CLL Society

Brian Koffman, MDCM, DCFP, FCFP, DABFP, MSEd

(Member at Large)

Dr. Koffman, a well-known doctor, educator, and clinical professor turned patient, has dedicated himself to teaching and helping the CLL community since his diagnosis in 2005. Dr. Koffman believes that his dual status as a physician and patient provides a unique experience and understanding which allows him to provide clear explanations of complex issues and to advocate for his fellow patients and inform his fellow healthcare providers. This is especially important in view of the rapidly changing therapeutic landscape. Besides his medical degree, Dr. Koffman has a Master of Science in Medical Education. Dr. Koffman is also a retired family doctor, a retired clinical professor in family medicine at the Keck School of Medicine, USC, and the former medical director of the nonprofit medical educational organization, Primary Care Network. Dr. Koffman co-founded and currently serves as the Chief Medical Officer and EVP of CLL Society Inc.

Read Dr. Koffman’s Medical Bio

John Backus - CLL Society

John Backus

Mr. Backus is Co-Founder and Managing Partner of PROOF, a venture capital fund. He is a seasoned technology investor and entrepreneur with over three decades of experience investing in and managing rapidly growing companies. Before becoming a venture capitalist, he co-founded US Order, which revolutionized online banking, went public in 1995 and was sold to Visa.

Mr. Backus served four years on the Board of Directors of the National Venture Capital Association (NVCA),is Chairman Emeritus of the Northern Virginia Technology Council (NVTC) Board of Directors, has served as a technology policy adviser to Virginia governors Gilmore, Warner and McDonnell and has contributed his views to The Washington Post, TechCrunch, Fortune, VentureBeat and the Huffington Post. Mr. Backus began his career at Bain & Co. and Bain Capital, where he was the first management consultant to take a full time operating role in a portfolio company.

He has a B.A. in Economics from Stanford University and an MBA from Stanford University Graduate School of Business.

Robert Levis - CLL Society

Robert Levis


Mr. Levis is a graduate of Grove City College (BS ’73) and the University of Illinois (MS ’75). His professional career includes 32 years with Air Products & Chemicals, Inc., including 22 years on overseas assignments in Brazil, Japan, Taiwan, and Singapore where he was VP/GM of the company’s largest division in Asia. Following retirement from Air Products, Mr. Levis also worked for ABEC (bioreactor manufacturer) as director of business development in Asia and now consults for Asia & Brazil Connections, LLC.

Mr. Levis was diagnosed with chronic lymphocyctic leukemia (CLL) while on his executive business assignment in Singapore in 2002. Following several years of treatments through remissions and relapses, Bob’s CLL became more aggressive. Without any other treatment options, he enrolled as one of the early experimental CAR T patients in 2013 at Penn Medicine in Philadelphia. The first CAR T procedure put Mr. Levis’ CLL into complete remission for three and a half years. He had a second CAR T while on ibrutinib at Penn Medicine in 2017 and his CLL is now minimum residual disease and stable on ibrutinib.

In addition to his board commitment to CLL Society, Mr. Levis is on the Abramson Cancer Center Director’s Leadership Council at Penn Medicine. He is also active with the biopharma industry and university research hospitals on patient advocacy initiatives and new CAR T science business development.

Susan O’Brien - CLL Society

Susan O’Brien, MD

Susan O’Brien, MD is the associate director for Clinical Science at the Chao Family Comprehensive Cancer Center, the medical director of the Sue and Ralph Stern Center for Cancer Clinical Trials and Research, Professor of Medicine in the Department of Hematology and Oncology, and the endowed chair of Cancer Clinical Science at University of California, Irvine. She earned her medical degree from and completed her residency in Internal Medicine at the University of Medicine and Dentistry of New Jersey (currently known as the Rutgers School of Biomedical and Health Sciences). She completed her fellowship at the University of Texas MD Anderson Cancer Center in Houston, TX where she spent over 30 years of her career advancing science in cancer, specifically in the field of leukemia.

Dr. O’Brien is an internationally recognized leader in the research of treatments for both acute and chronic lymphocytic leukemias and an expert on several important therapies that are presently used as the standard of care for chronic lymphocytic leukemia. Her work is credited with improving cure rates for these blood cancers. She is routinely recognized on America’s Top Doctors, Super Doctors and America’s Top Doctors for Cancer. She has been a principal investigator and driving force behind more than 100 funded clinical research protocols, 30 invited articles, numerous book chapters and abstracts, and has authored more than 900 articles in peer-reviewed journals. In 2020, she was named the Giant of Cancer Care in Leukemia for sustained contributions in the field. She is the Hematology Executive member of SWOG and the President of the Society of Hematologic Oncology (SOHO).

David Stern - CLL Society

David Stern

David Stern is an attorney and founding member of the law firm of Klee, Tuchin, Bogdanoff & Stern LLP.  His expertise in corporate bankruptcy and reorganization has involved him in many of the largest bankruptcies of the last 50 years.

David’s involvement with CLL began in 2002 when his wife, Cheryl, was diagnosed with the disease.  He was involved in her care in Los Angeles (Tower Oncology, Cedars Sinai), Houston (MD Anderson) and Irvine (Chao) until her death in 2020.  However, during those 18 years, David and Cheryl – parents of three children and grandparents of four grandchildren – lived life to the fullest, traveling the world, including spending most Septembers and Octobers in Florence, as Cheryl was an art historian and Florence was her dream city.  David’s primary concern is helping CLL patients and their caregivers to live fully despite the disease and to give comfort and counseling to patients and caregivers if and when necessary.

David has a B.A. in economics from Columbia College (N.Y.) and a J.D. from the Stanford Law School.

Kirk Taylor - CLL Society

Kirk Taylor, MD

Dr. Kirk Taylor is a biotech and pharmaceutical executive with over 26 years of experience in drug development and product launches.  He has successfully launched products in CLL, bladder cancer, NSCLC, multiple sclerosis, ophthalmology, migraine, hemophilia, and pain.  His passion for patients and people is evident in his work in healthcare equity, diversity in clinical trials, care for the care givers and higher level educational opportunities for at risk youth.  He is currently the Chief Medical Officer, EVP at Brainstorm Cell Therapeutics in Burlington, MA, working on a late stage treatment for ALS and Progressive Multiple Sclerosis. Dr. Taylor received his BA from Harvard College, MD from SUNY Downstate, Neurology Training from Albert Einstein College of Medicine and post doc training in neuropathic pain and headache from UCSF.  He has completed executive leadership training from Columbia, Stanford, INSEAD, Berkeley and Harvard Business Schools.  He is on the Board of Directors for the Augustus A White III Healthcare Equity Institute and the Board of Advisors for Bottom Line.