Our Staff

Michael Gelb, MD, Interim Behavioral Health Director

 Dr. Gelb was born and raised in Tenafly, New Jersey. He graduated from Princeton University and after graduation did research on narcolepsy at the Stanford University Sleep Disorders Research Center.  He graduated from the Mount Sinai School of Medicine in 1998 and did his psychiatric residency at the University of California, San Francisco, where he worked at the student health center.  After residency, he worked at the Trauma Recovery Center at San Francisco General Hospital, treating victims of crime, and developing a research and clinical program around treatment of acute trauma, in addition to maintaining a private practice.  He fell in love with Portland and moved here in 2006, seeing patients in a full time private practice.  He was thrilled and honored to begin working at the JBT Health Center in 2013.  When not at work, he enjoys hiking, reading histories and biographies, and reading to his 7 year old daughter and 4 year old identical twin sons.

Daisy Lembke, PsyD

Dr. Daisy Lembke earned her doctorate in Clinical Psychology from the Pacific University School of Professional Psychology in 2006.   As part of her training and professional work, she has worked in many educational settings, conducting psychosocial/ educational assessments and providing therapy.  She did her post-doctoral training in the student health center at Reed College.  She has also worked as a staff psychologist at the University of Portland and in private practice.  Dr. Lembke's areas of clinical focus include anxiety and mood disorders, life transitions, managing emotions, self-esteem, enriching relationships, and reducing stress.  She joined the staff of the JBT Health & Wellness Center in May of 2013, and is excited to be part of the OHSU community.

Melissa Mannke, ANP, WHNP

Melissa Mannke graduated from the University of Massachusetts Amherst with a bachelors of nursing degree in 2005. She spent the following 5 years working as a registered nurse on inpatient cardiac units and then went on to graduate school at Columbia University to pursue a career as a nurse practitioner. She specialized as an adult and women's health nurse practitioner and graduated in 2010. Since graduating she has practiced in a private internal medicine practice and student health clinic at Northeastern University in Boston. She is particularly interested in health promotion, disease prevention, and women's health.

Lindsey Field, FNP, L.Ac.- Coming Soon

Lindsay is a Family Nurse Practitioner and board certified Acupuncturist. She graduated with a Master’s of Acupuncture and Oriental Medicine from the Oregon College of Oriental Medicine in 2001. After working in both private practice and at OHSU Integrative Clinic, she knew that she wanted to become a primary care clinician who could weave the strengths of Eastern and Western Medicine into a dynamic, integrative medical practice.  Therefore, she went on to complete the Nurse Practitioner Program at OHSU in 2010. She is also currently completing University of Arizona’s two-year distance Integrative Medicine Fellowship (expected 2015).

She has particular interest in women’s health, integrative and preventative medicine.  When not in clinic, she enjoys spending time with her husband, their two boys and dog Stella.

Jack Crossen, Ph.D.

Dr. Crossen completed his doctorate specializing in Clinical Psychology at the University of New Mexico in 1985.  His internship and two post-doctoral years of training were at OHSU, where he was Chief Resident in Medical Psychology.   As an OHSU faculty member for over 20 years, he has trained residents, taught students, published research, and provided clinical services in collaboration with primary care providers and specialists.  His duties since 2002 have been to provide counseling to OHSU students and to serve as Chief of Counseling and Behavioral Health Services.  He is a certified Gottman couple's therapist and also emphasizes similar evidence-based assessment and treatment in individual counseling with students.  He is particularly interested in the problems faced by students that include anxiety, depression, stress and relationships.     

Nancy Kalvelage, N.P.

Ms. Kalvelage is a graduate of the OHSU School of Nursing, with graduate training as a women's health care nurse practitioner. With over twenty years experience providing health care to students in the Portland area, Ms. Kalvelage brings a depth of experience to her role as a vacation provider in the JBT Health & Wellness Center. She enjoys yoga, aerobics, and hiking in the Columbia Gorge.   Facts of interest: she has 3 whippets and raises pygmy goats.

Lisa Schimmel, Ph.D.

Dr. Lisa Schimmel earned her doctorate in Clinical Psychology from the California School of Professional Psychology, San Diego in 1994 and did her post-doctoral training in a private practice setting, providing ADHD and Learning Disability assessment to children, adolescents and adults.  She acquired additional training as a post-doctoral fellow at The Center for Social Services' AIDS Response Program in San Diego, working with HIV impacted/infected individuals, sero-opposite couples, chemically dependent persons, and general LGBTQ related concerns.  In private practice her clinical focus has been on life/work transitions, adjustment, anxiety and mood disorders, sexual orientation issues, self-esteem, relationship enhancement and stress reduction.  In addition to private practice, Dr. Schimmel has worked as staff psychologist and clinical supervisor to graduate psychology trainees as well as clinical consultant to established clinicians.  As someone passionate about training and teaching, she has served as Director of Clinical Training, and worked extensively as a professor for both graduates and undergraduates teaching courses related to clinical, diagnostic, and cultural competency. Dr. Schimmel is delighted to be a part of the JBT Health & Wellness Center and the OHSU Campus Community.

Sarah Lemley, MPA; HA

Sarah is the Practice Manager at the JBT Health & Wellness Center.  She holds a graduate degree from Portland State University in Public Administration; Health Administration.  Her undergraduate studies were completed at University of Oregon where she earned a Bachelor of Science degree in Sociology with a minor in Women Studies.  Sarah has worked in the healthcare field for the past 10 years in a variety of roles ranging from social worker to regional management.  She serves on the Oregon Attorney General's Sexual Assault Task Force and is a certified Rape Victim Advocate volunteer with Multnomah County.  She enjoys yoga, frequenting the Oregon coast and trying to keep up with her 5 year old.  She is an avid Oregon Duck football fan and is looking forward to the upcoming season.

Rachel Gustafson, BSN RN CEN

Rachel is the Nurse Manager at the JBT Health & Wellness Center.  She holds a BSN from Linfield College, and is a Certified Emergency Nurse. Rachel has worked in the healthcare field for the past 15 years in a variety of roles, ranging from admitter to interim ED Nurse Manager. She has served on multiple OHSU-wide committees, most recently the Ebola/MERS Prevention Planning work group and the RN Role Description Committee. Her areas of special interest include psychiatric illness, substance abuse, domestic violence awareness and safety planning, and broadening the scope of the professional nurse. During her off hours, she enjoys chasing her children around the house, spending time with her husband and ten pets, and taking cross-country road trips.