Northwoods Urology Associates


Our Physicians




















Northwoods Urology Associates

Ronald G. Henry, MD
John G. Giannakis, MD
Paul R. Kenworthy, MD
Michael F. Graham, Jr., MD
Matthew M. Hogan, MD
Liliana Woo, MD
Drew Dylewski, MD
Clyde L. Corey, MD
Deborah T. Hooker, RN, MSN, CCRN, ACNP-CS
Karen MacKenney, RN, MSN, FNPC

Ronald G. Henry, MD

Ronald G. Henry, MD Dr. Henry has been practicing in the field of urology since 1980. He earned his medical degree from Baylor College of Medicine in Houston, Texas and completed his surgical residency at the University of Hawaii in Honolulu and his urology residency at the University of Texas Health Science Center in Houston.

Dr. Henry is board certified by the American Board of Urology and is associated with the following professional organizations: Montgomery County Medical Society, Texas Medical Association, Houston Urologic Association, American Medical Association and American Association of Clinical Urology.

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John G. Giannakis, MD

John G. Giannakis, MDDr. Giannakis earned his medical degree from Oregon Health Sciences University Medical School in Portland Oregon. He received his surgery and urology training at the University of Texas Health Science Center at Houston. During his urological residency he served as Chief Resident in Urology. He has been practicing in the field of urology since 1991.

Dr. Giannakis specializes in laser surgery, extracorporeal shockwave lithotripsy and microvascular surgery.

He is board certified by the American Board of Urology and is affiliated with the following professional organizations: Harris County Medical Society, Texas Medical Association, Houston Urologic Association, Texas Urologic Association, American Medical Association, American Urological Association and Southern Medical Association.

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Paul R. Kenworthy, MD

Paul R. Kenworthy, MDDr. Kenworthy graduated summa cum laude in biology from Wittenberg University, in Springfield, Ohio. He earned his M.D. from Ohio State University College of Medicine. He completed residencies in surgery and urology at the University of Texas Health Science Center at Houston.

Dr. Kenworthy's research has been published in Urology and the Journal of Urology, as well as in several scientific proceedings and presentations.

Dr. Kenworthy is board certified by the American Board of Urology.

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Michael F. Graham, Jr., MD

Michael F. Graham, Jr., MD Dr. Michael Graham joined Northwoods Urology in July of 2001. He earned his medical degree from Baylor College of Medicine in Houston, Texas. He completed his residency in general surgery at the University of Texas Health Sciences Center in Houston. He completed his residency in general urology at Hermann Hospital and was an acting fellow M.D. at the Anderson Cancer Center from 1995 to 1996.

Dr. Graham has been a clinical instructor in surgery/urology at the University of Texas Health Science Center at Houston since 1997. Dr. Graham is board certified by the American Board of Urology and is associated with Harris County Medical Society, Texas Medical Association, and the American Urological Association.

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Matthew M. Hogan, MD

Matthew M. Hogan, MDDr. Hogan joined Northwoods Urology in July 2003. He earned his medical degree from University of Texas Health Science Center in Houston. He also completed his urological and general surgery internship with the University of Texas at Houston. Dr. Hogan is board certified by the American Board of Urology. He is associated with the following professional organizations: American Urological Association, Endourological Society, American Association of Clinical Urologists, and the Texas Medical Association.

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Liliana Woo, MD

Liliana Woo, MDIn 1995, Dr. Woo received her bachelor of science, honors degree in microbiology from The University of Texas at El Paso. From there, she earned her medical degree from Harvard Medical School in 1999. She followed that with a general surgery internship and urology residency at University of Texas Health Science Center in Houston. Her honors include being a Top Ten Senior at UT El Paso and being elected to the Third World Caucus Chair while at Harvard Medical School. Dr. Woo is board certified by the American Board of Urology. Dr. Woo joined Northwoods Urology in 2004 and is a member of the American Medical Association, American Urological Association, and the Harris County Medical Society.

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Drew Dylewski, MD

Drew Dylewski, MD

A graduate of Princeton University, Dr. Dylewski earned his medical degree from Baylor College of Medicine in Houston, Texas. He completed his training in surgery and urology at Duke University Hospital in Durham, North Carolina. He joined Northwoods Urology in 2007 and is a member of the American Medical Association and American Urological Association.

Dr. Dylewski has a clinical interest in robotic and laparoscopic procedures, and performs robotic-assisted prostatectomy for the management of prostate cancer.

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Clyde L. Corey, MD

Clyde L. Corey, MD

Dr. Clyde Corey is a board-certified urologist in practice since 1993. He received his medical degree from the University of Texas Southwestern Medical School, Dallas, TX. He served his surgical internship and urological residency at the University of Texas Medical School, Houston, where he was Chief Resident, Urology. He is a member of the Texas Medical Association, Texas Urological Society, American Association of Clinical Urologist, American Lithotripsy Society and American Urological Association. He is past president of the Montgomery County Medical Society and served at Tomball Regional Hospital as Chairman of the Department of Surgery and Chief of Staff.



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Deborah T. Hooker, RN, MSN, CCRN, ACNP-CS

Deborah T. Hooker, RN, MSN, CCRN, ACNP-CSNurse Hooker is an Acute Care Nurse Practitioner. She received her undergraduate nursing degree at San Jacinto College, in Pasadena, Texas and her BSN, summa cum laude, in nursing from Prairie View A& M University, The University Center/Woodlands in Houston, Texas. She completed her Acute Care Nurse Practitioner Program at the University of Texas,Houston, in May of 2000.

She is the recipient of the following awards and honors:

  • Good Samaritan Foundation Scholarship
  • National Institute of Health Professional Nurse Traineeship
  • Member, Sigma Theta Tau, Zet Pi Chapter, International Nursing Honor Society
She is a certified Adult Critical Care Nurse, Acute Care Nurse Practitioner and is certified in Advanced Cardiac Life Support.

Nurse Hooker is a member of the American Association of Critical Care Nurses and the American Academy of Nurse Practitioners. She is a Nurse Volunteer for the Conroe Independent School District and the South County Community Clinic.




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Karen MacKenney, RN, MSN, FNP-C

Karen, RN, MSN, CCRN, ACNP-CSKaren is a certified Family Nurse Practitioner. She received her undergraduate degree at North Harris Montgomery College and her Bachelors Nursing Degree at The University of Wyoming, Laramie, Wyoming. She completed her Family Nurse Practitioner Program and received her Masters Nursing Degree at The University of Texas Medical Branch, Galveston, Texas. Karen has over 15 years of nursing experience and 10 years of urology experience. She is a member of North Harris Montgomery County Advanced Practice Nurse Association, Texas Nurse Practitioners Association, and Sigma Theta Tau, Alpha Pi Chapter, International Nursing Honor Society.



Northwoods Urology Associates
1501 River Pointe Drive
Suite 160
Conroe, TX 77304
Tel: 936.441.6688

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135 Vision Park
Shenandoah, TX 77384
Tel: 281.404.3000

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350 Kingwood Medical Drive
Suite 140
Kingwood, TX 77339
Tel: 281.359.1911

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100 Medical Center Parkway
Suite 600
Huntsville, TX 77340
Tel: 936.435.9200

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919 Graham Drive
Suite A
Tomball, TX 77375
Tel: 281.290.9800

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18059 Hwy 105 W.
Suite 115
Montgomery, TX 77356
Tel:936.582.6454

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