Isaac Ciechanover, M.D.

CEO & President

Dr. Isaac Ciechanover is a physician, investor and entrepreneur driven by a passion to improve the practice of medicine. Motivated by the belief that the majority of medical discoveries still lie ahead, he has dedicated the past 20 years to working with entrepreneurs and life sciences organizations to advance medicine through innovation and technology. He founded Atara Biotherapeutics in August 2012. Previously, he was a partner in the life sciences practice at Kleiner Perkins Caufield & Byers. Earlier as Celgene’s Executive Director for Business Development, he spearheaded the company’s venture capital efforts and led licensing and M&A activities with an aggregate value of more than $6.7 billion. Also at Celgene, he was Global Project Leader for the company’s first clinical-stage biologic therapy. Isaac has also held business development and venture capital roles at Amylin Pharmaceuticals, Pequot Ventures’ healthcare practice and Pfizer. Intellectually curious (and undeterred by student debt), Isaac holds a B.A.  from Stanford University, an M.Phil. in Epidemiology from Cambridge University, an M.D. from Weill Cornell Medical College and an M.B.A. from Harvard Business School. For fun, he enjoys cycling, scuba diving and building Lego with his two children. His all-time favorite albums are Pink Floyd’s “The Dark Side of the Moon,” Radiohead’s “OK Computer” and Ruggero Leoncavallo’s Italian opera, Pagliacci, with Herbet Von Karajan conducting.

Mitchall G. Clark

EVP and Chief Regulatory & Quality Officer

Mitch Clark is the EVP, Chief Regulatory and Quality Assurance Officer at Atara Biotherapeutics with responsibility for global regulatory strategy and quality assurance. Mitch has over 30 years of global Regulatory Affairs, Quality Assurance, and Drug Development experience in the pharmaceutical industry. His professional experience includes senior management roles at a number of organizations such as Schering AG (based in its UK and Berlin offices), American Pharmaceutical Partners (APP), Abraxis Bioscience, Celgene Corporation, and NantPharma, LLC.

Among his significant previous positions, Mitch served as the Senior Vice President, Regulatory Affairs at NantPharma, LLC where he established the Regulatory Affairs and Quality Assurance functions. He was Senior Vice President of Global Regulatory Affairs at Abraxis where he created and managed the regulatory team responsible for filing the initial IND and obtaining the global regulatory approvals of Abraxane®, the first albumin-bound nanoparticle product for the treatment of solid tumors.

Earlier in his career, he worked for large and small organizations. Most notably, he gained valuable international experience in positions of increasing responsibility with Schering AG, working in the Berlin head office and UK subsidiary where he played a key role in the global approvals of the first-in-class gadolinium-based MRI contrast agent, Magnevist®.

Mitch holds a B.Pharm from The University of Nottingham, England. He enjoys a wide range of outdoor pursuits including canoeing, sailing and motorcycling.

Christopher Haqq, M.D., Ph.D.

EVP, R&D and Chief Scientific Officer

Dr. Christopher Haqq is the EVP, Chief Scientific Officer, and joined Atara Biotherapeutics in September 2012. He brings 20 years of clinical, academic and drug development experience from biopharma companies large and small. He was recently Vice President for Clinical Research and Development at Cougar Biotechnology and Johnson & Johnson’s Janssen, where he was the lead clinician for a pivotal prostate cancer study leading to market approval for Zytiga® (abiraterone acetate). Previously at Amgen, he led early development studies of the anti-insulin like growth factor type 1 receptor AMG 479 (ganitumab) antibody. He has served as medical monitor for more than 10 clinical trials and has contributed to drug development programs for a wide range of molecules. Chris has worked closely with the European Medicines Agency, the U.S. Food and Drug Administration and other global regulatory agencies–filing IND applications, new drug applications, special protocol assessments and their international equivalents. Earlier in his career, Chris practiced as a medical oncologist and led a translational science laboratory as an Assistant Adjunct Professor in the Division of Hematology/Oncology at the University of California, San Francisco. In his post-graduate training, also at UCSF, he served as an Intern and Resident in Internal Medicine, Fellow in Medical Oncology and Fellow in Molecular Medicine. Chris completed his M.D. and Ph.D. at Harvard Medical School and his B.S. at Stanford University. He is board certified in Medical Oncology and Internal Medicine. Chris is an inventor of several patents and an author of more than 50 medical publications. In his free time, he enjoys astronomy and photography.

John F. McGrath, Jr.

EVP and Chief Financial Officer

John F. McGrath, Jr. is the EVP, Chief Financial Officer, and joined Atara Biotherapeutics in January 2013. He was previously Executive in Residence and Operating Partner at Kleiner Perkins Caufield & Byers. John was also Vice President and Chief Financial Officer for Network Equipment Technologies, Inc., which developed and sold network equipment for real-time communications. Earlier in his career, he was Vice President of Finance for Aspect Communications, Director of Finance for TCSI Corporation and Manager in the High Technology and Manufacturing practice at Ernst & Young. John is a registered C.P.A. (inactive) in California and earned a B.S. from the University of Wyoming and an M.B.A. from the Stanford Graduate School of Business. John has served on the board of the Presidio Fund, a publicly traded mutual fund, and as Audit Committee Chairman on the boards of Actel Corporation and Endwave Corporation. Away from work, John enjoys running (including three marathons), swimming and traveling.

Joe Newell

EVP, Chief Technical Operations Officer

Joe Newell joined Atara Biotherapeutics as the EVP, Chief Technical Operations Officer in April 2017 with global responsibility for Technical Operations and Facilities.

Prior to joining Atara, he was Vice President, North America Manufacturing at Alexion Pharmaceuticals, a company dedicated to treating patients with life-threatening ultra-rare disorders. He was responsible for bulk drug substance production of Soliris® and the transgenic manufacturing operations for Kanuma®, the only FDA-approved treatment for lysosomal acid lipase deficiency (LAL-D).

Previously, Joe spent several years at Amgen where he served in a number of global leadership roles in Manufacturing and Supply Chain, including an expatriate leadership assignment in Puerto Rico, where he was part of launch efforts for Prolia®, Xgeva® and Repatha®.  Earlier in his career, he held leadership and entrepreneurial roles with Catalent Pharma Solutions, Matrix Pharmaceutical and SRI International.

Joe holds a BS in Biology from California Polytechnic University, Pomona.  Away from work, he is dedicated to his wife and three children.  For fun, he enjoys the outdoors, sports and a variety of restoration projects.

Gad Soffer

EVP and Chief Strategy Officer

Gad Soffer is the EVP, Chief Strategy Officer, and joined Atara Biotherapeutics in March 2013. Previously at Celgene, he led the global project team responsible for product development and lifecycle management for Abraxane, a breast, lung, and pancreatic cancer treatment also in development for melanoma. He also led numerous business development transactions at Celgene while advising on venture investment and strategic partnerships. Earlier, Gad was a healthcare consultant with Easton Associates. He earned an M.B.A. at Harvard Business School, an M.S. at Columbia University and an A.B.from Harvard University. In his free time, Gad enjoys geology, fly-fishing, canoeing and snowshoeing. In 2001, he was inducted in the National Wrestling Hall of Fame.

Steve Bertram

SVP, Global HR

Steve Bertram is the SVP of Global Human Resources, and joined Atara Biotherapeutics in August 2016. Prior to joining Atara, Steve was with Amgen where he held a number of business facing HR executive level roles with both domestic and global accountabilities and staff.  Functional areas of HR leadership included Global Development, Global Commercial, Translational Sciences, Discovery Research, and Technical Operations.

Prior to Amgen, Steve was with the Coca-Cola organization in Atlanta supporting their flagship global Marketing team.  Steve began his career with The Upjohn Company in Kalamazoo, Michigan holding roles of increasing accountability in corporate, commercial and international organizations.  Steve holds a BBA from Western Michigan University in Business and an MBA from Michigan State University.

Away from work, Steve enjoys time with his wife and three kids.  For fun he enjoys scuba diving, canoeing in Michigan, attending sporting events and travel.

AJ Joshi, M.D.

SVP, Medical Affairs

Dr. Manher (AJ) Joshi joined Atara Biotherapeutics in August 2016, and serves as its Senior Vice President, Global Medical Affairs. At Atara Bio, AJ is responsible for global medical affairs and the health outcomes and market access research functions.  He brings over 15 years of clinical, drug development and commercialization experience in orphan and large markets.  He has built and led medical organizations through several launches across a broad range of therapeutics areas including neuromuscular disease, neurosciences, genetics, metabolic diseases, urology, and dermatology. AJ’s previous medical affairs and organizational leadership roles include US Medical Affairs Therapeutic Area Head at Allergan, SVP Strategic Development and Medical Operations at Synageva, and Vice President Medical Affairs and Operations at Genzyme.

Dr. Joshi received his MD from the Boston University School of Medicine, his BA from Boston University, and completed his Internship and Residency in Medicine at Yale. In his free time, AJ enjoys photography, traveling, and playing the guitar.

Derrell D. Porter, M.D.

SVP, Global Commercial Head

Dr. Derrell Porter joined Atara Biotherapeutics as SVP, Global Commercial Head in May 2017 with responsibility for worldwide commercial operations.

Prior to joining Atara, he was a Vice President with Gilead Sciences, where he was responsible for corporate strategy, long term commercial planning, and global launch preparation for pipeline compounds in all of Gilead’s therapeutic areas – Oncology, HIV, Liver Diseases (HCV, HBV, and NASH), CV, and Inflammatory Disorders. During his tenure at Gilead, he oversaw the commercial preparation for 8 global brands and expanded the team’s pricing/market access as well as competitive intelligence capabilities. Before Gilead, he was with AbbVie and Amgen, where he held multiple US, EU and global roles including VP/GM, EU regional marketing lead, sales manager and corporate development director.

Earlier in his career, Derrell was a McKinsey & Company management consultant in Los Angeles and worked on global biopharmaceutical engagements. Dr. Porter currently serves on the board of directors for Biosortia Pharmaceuticals.

Derrell holds a B.S. from UCLA, an M.D. from University of Pennsylvania’s Perelman School of Medicine where he was a Gamble Scholar, and an M.B.A. from The Wharton School. In his free time, he enjoys biking, reading non-fiction, cooking, and traveling with his two children.