Your Team

Trust your health in the hands of experts recognized for medical excellence. Your clinicians are members of trusted medical organizations promoting male health, including the American Urologic Association, American Society for Reproductive Medicine and the American Society of Andrology. All societies keeping our clinical team at the cutting edge of “evidence based male healthcare”.

Russel Williams, MD

Chief Executive Officer (CEO)
Chief Medical Officer (CMO)

Dr. Russel Williams has dedicated 20 years of his life to the health and wellbeing of men, specializing in men’s…

Tristan D. Grimaldo, DNP, APRN, MHSM, FNP-C

Chief Clinical Officer (CCO)
Chief Business Development Officer (CBDO)

Tristan Grimaldo is a board-certified family nurse practitioner with a clinical doctorate specializing in reproductive urology. Dr. Grimaldo brings seven…

Ben Martinez, MS, APRN, FNP-C

Medical Provider

Benancio Martinez Jr is a certified Family Nurse Practitioner (FNP-C) and brings a wealth of experience to The Y Factor team. Benancio is the lead medical provider at the Tomball and Woodlands locations…

Mike Manis, MS, APRN, FNP-C

Medical Provider

Mike Manis is a board-certified nurse practitioner with a master’s of science in nursing. Mike brings 8 years of nursing experience to The Y Factor. He graduated with honors in 2012, cum laude, with a bachelor of science in nursing…

Andre Piliszek, DC, MSN, APRN, FNP-C

Medical Provider

Andre Piliszek is a certified Family Nurse Practitioner (FNP-C) and brings to The Y Factor over 25 years of outpatient clinical experience as a certified DOT medical examiner, Nurse, Medical Assistant, and Radiographer…

Ahmad Tabbara, MS, APRN, FNP-C

Medical Provider

Ahmad Tabbara is a board certified Family Nurse Practitioner (FNP-C) and brings a wealth of knowledge to The Y Factor. Ahmad has a bachelor’s degree in biology from the University of Texas at Austin…

Kyle Garrow, MS, APRN, FNP-BC

Medical Provider

Kyle Garrow is a board-certified Family Nurse Practitioner (FNP-BC). Kyle earned his bachelor’s degree in nursing from Sam Houston…

Karen Barnett

Practice Manager

Karen Barnett brings 15 years of managerial experience in healthcare to The Y Factor team. She graduated from The University…

Stephanie Alvarado

Surgery Coordinator

Stephanie Alvarado is the primary surgery scheduler and liaison between the surgery facility, patient and doctor. She keeps in close…

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