Radiation oncology firm Varian Medical Systems has announced changes to top management positions at two of its divisions.
The company has appointed Kolleen Kennedy to a new role as president and chief growth officer at Proton Solutions -- the Varian division formerly known as Particle Therapy. Kennedy, who has served at Varian for 21 years, was most recently president of Varian Oncology Systems.
Chris Toth, a 19-year Varian employee, will succeed Kennedy as the new president of Varian Oncology Systems. He previously served as president of global commercial and field operations.
![A 53-year-old patient (patient number four) with a recurrent pituitary adenoma with extension of a cystic component of disease to the medial temporal lobe apparent on MRI (contoured in blue), and extension of disease to the left sphenoid bone and orbital apex apparent on [68Ga]Ga-DOTA-TATE (contoured in yellow).](https://img.auntminnie.com/mindful/smg/workspaces/default/uploads/2026/04/pituitary-tumor.QGsEnyB4bU.jpg?auto=format%2Ccompress&dpr=2&fit=crop&h=167&q=70&w=250)
