Grayber earned a Bachelor of Science degree in homeland security and emergency management from Concordia University.

Prior to entering politics, Grayber has worked as a firefighter and paramedic for Tualatin Valley Fire and Rescue.

[4][5][6][7] Grayber was elected to the Oregon House of Representatives in 2020 with 67.1% of the vote, defeating Republican businessman and engineer Bob Niemeyer.

[4] Grayber was cited as part of a wave of frontline medical workers that were elected to office during the 2020 pandemic.

[8] In June 2021, Grayber assisted Rep. Pam Marsh in passing a $190 million wildfire mitigation bill that established wildfire risk maps, programs to bolster recovery and adapt communities to smoke, and called for changes to buildings within a wildland-urban interface.