New Horizons Team

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Our team

Oxana Antonevich


Since graduating from Boston University, Oxana always supported her late husband Dr. Yanants Antonevich’s values, beliefs, dreams and ambitions. She is dedicated to upholding his legacy to deliver the highest quality care, respect and dignity to the patients.

Vahan Meliksetyan

Chief Operating Officer

Vahan Meliksetyan ensures the company has effective operational and financial procedures in place while ensuring the clinic is delivering efficient services that satisfy patient needs.

Eni Zheku

Director of Operation

Eni Zheku is accountable for supporting organizational operations and infrastructure and has worked towards the mission of NHM since 2016.

Tatiana Tinsley

Office Manager

Tatiana Tinsley oversees the administrative team in the Lynn office and supports general office operations.

Olga Belyakova

Office Manager

Olga Belyakova is the Billing Manager for New Horizons Medical and also serves as an Office Manager for our Framingham Location.


Stella Uchendu

Stella Uchendu_3672b_2by3 Nurse Practition

Stella Uchendu has been practicing medicine for 4 years and Addiction Medicine for 3 years. She holds a baccalaureate degree in Nursing Science from Salem State University and a Master of Science in Nursing Practice from Regis College.

My mission is to focus on the person as a whole, as well as the family members, and address the trauma while finding new ways to cope with their addiction

Melvin Nemkov

Medical Director

Dr. Melvin Nemkov graduated from the University of Illinois College of Medicine in Chicago and has been practicing medicine and addiction medicine for 45 years and counting.

My mission is for everyone to be truly happy with their lives

Annette Okereke


Annette Okereke obtained a baccalaureate degree in Nursing from Simmons College, a Master in Nursing from Regis College, Doctorate in Nursing Practice from UMASS Lowell, and later Post-Graduate Master in Nursing, PMHNP from Regis College.

My mission is to fulfill the purpose of my creator by making an impact in humanity and not give up on encouraging patients to fight on

Monica Andrade


Monica Andrade is a licensed nurse practitioner, practicing medicine for over 6 years. She has obtained a degree in nursing from the Graduate School of Nursing at UMASS Medical School in 2014.

My mission in life would be to continuously challenge myself and to dedicate my life to service and helping others

Laurie Botie

Medical Doctor

Dr. Laurie Botie, a board-certified physician, graduated from Mt. Sinai School of Medicine in New York, and has been practicing family medicine for 34 years before shifting her focus to addiction medicine.

My mission is to treat each individual with respect and believe that everyone is out there doing their best to get by in life

Jean Thomas

Jean Thomas_4389b_2by3 Nurse Practitioner

Jean Thomas is a licensed nurse practitioner who graduated with a baccalaureate degree in Nursing Science from UMASS Boston and later a FNP degree from Chamberlain University. Jean has been practicing medicine since 2018, providing adult, urgent care addiction while managing acute and chronic diseas

My mission is to be a provider that makes a true difference in a patient’s life

Johnelle Smith

Medical Doctor

Dr. Johnelle Smith has graduated from Wayne State University School of Medicine and has been working with New Horizons Medical since 2016.

My mission in life is to live each day to the fullest

Xuan Nguyen


Xuan Nguyen is a Licensed Adult Medicine Nurse Practitioner, practicing medicine for over 9 years. Xuan holds her baccalaureate degree in Nursing Science from Laboure College and Doctoral degree in Nursing from UMASS Dartmouth.

My mission is to encourage, engage, and equip others to believe in the possibilities

Daria Karos

Medical Doctor

Dr. Daria Karos is a board certified physician with specialty training in addiction medicine, adolescence, and pediatrics. She has been practicing medicine for over 25 years and has been with New Horizons Medical since 2015. 

I am passionate about the necessity for whole-person care as individuals and their families seek to recover from and prevent substance use disorders

Manlio Loconte


Dr. Manlio Loconte is a board-certified physician and has been practicing medicine for over 48 years and describes addiction medicine as fulfilling.

My mission and focus are to be kind, non-judgmental, and have a positive outlook on life

William Simmons

William Simons 3938b_2by3 LICSW

William Simmons is a Licensed Independent Clinical Social Worker who graduated with a Master of Social Work from Boston College. William has over 10 years of experience in providing psycho-therapeutic support for both MAT patients and stand-alone therapy patients.

My mission is to help and support our clients

Linda Ploude


Linda Ploude is a Licensed Independent Clinical Social Worker with over 15 years of experience in the field of mental health.

I believe strongly in the principles of self determination and believe all persons deserve to be listened to

Neeraj Rastogi

Medical Doctor

Dr. Neeraj Rastogi graduated from King George’s Medical College at Lucknow University and later attained ECFMG Certification in 2003.

I strive to help patients achieve their goals and maintain sobriety
Choose city
  • 358 Harvard St Brookline MA 02446
  • 617-879-0933
  • 617-202-9222
  • Mon. - Fri. 9:00 am - 5:00 pm Sat. 9:00 am -2:00 pm Sun. Closed
  • 214 Howard St Framingham MA 01702
  • 508-872-0773
  • 508-872-0700
  • Mon. - Fri. 9:00 am - 5:00 pm Sat. 9:00 am -2:00 pm Sun. Closed
  • 222 Blossom St Lynn MA 01905
  • 781-842-1379
  • 781-584-4645
  • Mon. - Fri. 9:00 am - 5:00 pm Sat. 9:00 am - 2:00 pm Sun. Closed
  • 500 Congress St Quincy MA 02169
  • 617-481-6254
  • 617-481-6949
  • Mon. - Fri. 9:00 am - 5:00 pm Sat. 9:00 am - 2:00 pm Sun. Closed