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Welcome to Lawrenceville

631 Professional Drive
Suite 450
Lawrenceville, GA 30046
Phone: 770.963.8030
Fax: 770.339.9577
Nurse: 762.261.0980


We are thankful you have chosen our practice as your trusted resource for oncology or hematology care. Our Lawrenceville office is our largest and most senior location, with a large staff dedicated to serving your needs. 

Our Lawrenceville office is affiliated with Northside Hospital Cancer Institute and is located on the Northside Gwinnett campus. We are located on the 4th floor of the Physician's Center at the Tony Landis Pavilion (named for one of our founding partners). 

Helpful office information

Physicians: Lawrenceville is served by 9 primary physicians- 

Dr. Alexander Saker

Dr. Aldemar Montero

Dr. Kevin Peacock

Dr. Mohan Krishnamachary

Dr. Ramandeep K. Bambrah

Dr. Vishal Ranpura

Dr. Haris Hatic

Dr. Dave Gupta

Nurse Practitioners:

Rebeca Klatt, NP

Carla Perry, NP

Wan Yang, NP-C

Roseline Tuopaeh, NP

Leslie Ross PA-C

Office hours: The office is open from 7:30 am to 5:00 pm, our phone lines are open at 8:30. Nurses are available from 8:30 am until 5:00 pm. Physician appointments are from 9:00 am until 4:00 pm. Our main office line is 770.963.8030.

Nurse Line:  Each office has as nurse line that you can call for any medical questions and concerns.  You will be prompted to leave a message for the nursing staff.  We have a nurse on call during business hours who checks the voicemail hourly and works closely with your physician to address your needs.  ALL calls will be returned by the end of the business day in the order of urgency. All messages left after 4:00 PM may not be returned until next business day. For all disability and FMLA paperwork please bring it to our office. Turnaround time is 7 to 10 business days. Our Lawrenceville nurse line is 762.261.0980

After Hours: If you are in need of medical advice after our office is closed, please dial our main number and our 'after hours' service will answer. They in turn will take your message and contact the physician on call for that day. You must disable your caller id block in order for the doctor to return your call. Please be aware that after hour calls may not be returned by the physician that you normally see in our office.

Directions to Our Office

631 Professional Drive

Suite 450

Lawrenceville, GA, 30046

From Atlanta:

  • Take I-85 North to the exit for Georgia Hwy 316 (exit 106)

  • Take Hwy 316 East for 4.9 miles to Hwy 120 (Duluth/Lawrenceville)

  • Turn right off of the exit

  • Go to the second light and turn right onto Professional Drive, Approx. 1/4 mi. down on the right is  the 631 Building, a 4 story medical building near hospital, we are in Suite 450 on the 4th floor


Keep up with our latest events and patient-offered activities on our Monthly Calendar!

Take advantage of everything our Northside Hospital Cancer Institute community has to offer here.

If you or a loved one finds that you need help with either oncology related or hematology needs, we are here for you every step of the way. From our patient coordinators to our medical staff, our employees are expertly trained to focus 100% on your needs. Please reach out to us with any questions you may have, or call our main office at 770.963.8030. We are your resource for Cancer Care.



Fax: 770.339.9577
Nurse: 762.261.0980

Phone lines open after 8:30 am



Monday - Friday

Open: 7:30 - 5:00

631 Professional Drive

Suite 450

Lawrenceville, GA 30046




Please do not use this contact form for sensitive medical questions, lab results or emergencies. For emergencies, please dial 911 immediately for assistance. Please allow at least 24 hours for response time.

Thank you for your help and understanding!

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