PRIMARY CARE
For more information about any of the doctors listed here, including their education, training, office locations and more, click on the highlighted specialties.
FAMILY PRACTICE
Physicians in this specialty provide continuous, comprehensive care of all members of the
family. They care for the majority of common illnesses and usually treat both adults and
children.
Thomas Chesar, Jr., M.D., Titusville*
Richard Reist, M.D. Tionesta*
William R. Sonnenberg, M.D., Titusville
Sherri L. Walker, D.O., Titusville*
James M. Zehner, M.D., Pleasantville*
INTERNAL MEDICINE
These physicians are trained to diagnose and treat problems of the organs and systems
within the body. Internal medicine physicians are considered to be primary care physicians
for adults.
Brian Los, M.D., Oil City, Titusville
Scott J. McAllister, M.D.,Oil City, Titusville
Cristian L. Popescu, M.D., Oil City, Titusville
Richard Whalen, M.D., Oil City, Titusville
James B. Wilkens, Jr., M.D., Titusville*
OBSTETRICS/GYNECOLOGY/INFERTILITY
Obstetricians are doctors who care for women during pregnancy and delivery and for a short
period after child birth. Obstetricians also usually specialize in gynecology, which
treats disorders of the female genital tract, endocrine and reproductive systems.
Infertility is concerned with the inability some patients have to conceive children.
Leonard A. Ferreira, M.D., Titusville
Ruthellen D. Weeks, M.D., Titusville
PEDIATRICS
The pediatrician is concerned with the care and development of children as well as
treating diseases of children.
Maria Lourdes N. Munoz, M.D., FAAP, Titusville*
Nori Y. Ruo, M.D., FAAP, Titusville*
Loreen Tan, M.D., Titusville*
PRIMARY CARE
SPECIALTY CARE
OTHER SPECIALTY FIELDS
*With the exception of these physicians marked with an *asterisk, all other physicians and dentists are independent practioners and not employees of Titusville Area Hospital.
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