Lauren Marienau, NP

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Address

20950 North Tatum Boulevard Suite 380 Phoenix, AZ 85050

Phone

480-956-5670

Hours

• Monday: 6:00 AM – 6:00 PM
• Tuesday: 6:00 AM – 6:00 PM
• Wednesday: 6:00 AM – 6:00 PM
• Thursday: Closed
• Friday: Closed
• Saturday: 7:00 AM – 7:00 PM
• Sunday: Closed

Insurances Accepted

Aetna
AHCCCS
AmeriBen
Champ VA
Carelon
Cigna
ComPsych
Contigo Health
DMBA
Devoted Health
EMI Health
The Holman Group
Humana
Magellan Health
Medicare
Meritain Health
Optum
Tricare
TriWest CCN
United Healthcare
University Health Plans
Uprise Health

Lauren Marienau, NP

Nurse Practitioner

(Reviews Coming Soon)

About Andrew Nichols, NP

Andrew Nichols, NP has over 10 years of healthcare experience spanning both military and civilian nursing. Born and raised in Houston, Texas, Andrew brings a sense of community to everything he does, and that same grounded, personal care carries into every patient interaction at Serenity.

Education and Background

Andrew earned his advanced practice degree from Texas State University and pursued specialized training in psychiatric mental health care. He served as a Lieutenant in the U.S. Navy, working as a Critical Care and En Route Care Nurse at Naval Hospital Okinawa and with the 3d Medical Battalion.
He joined Serenity drawn by the practice’s commitment to interventional treatments, including TMS and ketamine therapy, that go beyond conventional options to offer patients real, evidence-based paths forward.

Care Philosophy

Andrew approaches each session by staying present and grounded during even the most difficult moments. He meets every patient with understanding rather than judgment, and with care that is guided by clarity, honesty, and a genuine belief that treatment works best as a collaborative process.

What to Expect

In your first visit, Andrew will take time to understand what has been going on and what matters most to you before anything else. From there, you will build a plan together, one that feels manageable and effective. He listens closely and makes sure nothing important gets missed.

Personal Interests

When Andrew is not with patients, you will likely find him at the gym, reading a book, or practicing mindfulness. His greatest joy, though, is time with his kids, including volunteering at their school where he leads science experiments and happily takes on lunchtime duty.

about Lauren Marienau, NP

Lauren Marienau, PMHNP-BC, is a compassionate and skilled psychiatric mental health nurse practitioner at Serenity Mental Health Centers in Desert Ridge, AZ. Lauren is passionate about delivering personalized, patient-centered care that addresses the unique mental health needs of each individual. With expertise in evidence-based practices and a commitment to creating a safe, nonjudgmental space, she empowers her patients to take charge of their mental wellness journey.

Lauren began her healthcare career after earning her bachelor’s degree in nursing from Ottawa University. She gained valuable experience at Phoenix Children’s Hospital before pursuing her true passion—mental health care. She earned her master’s degree, becoming a board-certified PMHNP.

Lauren’s care philosophy is rooted in compassion, empathy, and collaboration. She believes that mental health care should address the whole person, taking into account the complex factors influencing well-being. By combining medication management with therapeutic communication and holistic support, Lauren develops treatment plans tailored to her patients’ individual goals and lifestyles.

Originally from the Midwest, Lauren has made Arizona her home since 2014. Outside of work, she enjoys spending quality time with her husband and their two dogs, Titan and Enzo. Whether hiking, traveling, or attending concerts, Lauren embraces life’s adventures and finds joy in simple moments. A dedicated reader, she loves discovering new perspectives through books.

Lauren looks forward to partnering with her patients at Serenity’s Desert Ridge clinic to help them overcome challenges like depression, anxiety, PTSD, and more. With her holistic approach and genuine care, Lauren is here to guide you on the path to mental wellness.