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Clinic Type

Gastroenterology

Address

17000 W North Ave Ste 105e, Brookfield, WI 53005

Phone

414-454-0600

Email

careers@ascension.org

Opening Hours

Not published — contact the clinic to confirm hours.

Emergency Care

If you are experiencing a life-threatening emergency, call 911 or go directly to the ER.

Services Offered

  • Gastroenterology - Digestive Health

Team

  • Nathaniel T Jest, DO — Gastroenterology - Digestive Health
  • Lauryn M Firkus, APNP — Gastroenterology - Digestive Health
  • Kristin L Zimmet, PA-C — Gastroenterology - Digestive Health
  • Katie J Balderas, PA-C — Gastroenterology - Digestive Health
  • Jacob C Laine, MD — Gastroenterology - Digestive Health
  • Erica A Samuel, MD — Gastroenterology - Digestive Health
  • Aaron C Baltz, MD — Gastroenterology - Digestive Health
  • Alison M Baierl, PA-C — Gastroenterology - Digestive Health

Insurance & Payment

Languages Spoken

Photos

What Patients Say

Overall sentiment across review platforms: positive

  • Birdeye/Google: 4.9 out of 5 stars (1,290 reviews)
  • Vitals: 4.7 out of 5 stars (18 reviews)
  • WebMD: 4.5 out of 5 stars (3 ratings)

Patients praise

  • Courteous and friendly staff
  • Effective communication of conditions and treatments
  • Comfortable bedside manner
  • Efficient check-in processes
  • High patient recommendation rates

Common complaints

  • Occasional administrative or scheduling miscommunication

"Dr. Samuel and her staff at G.I. Associates are awesome they made me feel very comfortable."

Vitals Review

"Dr. Velez is top notch. He is thorough, efficient and has excellent bedside manner. He also stays up to date on the latest treatment options."

LocalityBiz Review

Synthesized from public review platforms as of Jul 11, 2026 — sources: [1][2][3][4].

Information sourced from the clinic's website as of July 11, 2026.

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