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200 West 57th Street, Suite 1101
New York, NY 10019


Our Clinical Team

Our clinical team has credentials and experience that can wow even your hard-to-impress mom—and a passion to match.

The Extend Fertility Medical Practice Clinical Team

Joshua U. Klein

Joshua U. Klein, MD, FACOG

Chief Medical Officer and Reproductive Endocrinologist

Daniel Kort

Daniel Kort, MD, FACOG

Reproductive Endocrinologist

Alla Khamermesh

Alla Khamermesh, MS, CNM, WHNP

Women’s Health Nurse Practitioner

Dayna Hennessy

Dayna Hennessy, MSN, NP-C

Director of Clinical Operations

Toby Barsky

Toby Barsky, BSN, RN

Registered Nurse

Angela Austin

Angela Austin, BSN, RN

Registered Nurse

Sarah Steinle

Sarah Steinle

Fertility Advisor

Tania Guadalupe

Tania Guadalupe, CMA

Certified Medical Assistant

Our Clinical Team | Our Laboratory Team | Our Business Team