Phone: 210-989-1500 (main number)


Degrees and Certifications:

Bachelor's in Science (Biology)

Mr. George Vallejo

After graduating from St. Anthony High School in 1999, I attended Palo Alto College and the University of Texas at San San Antonio where I recieved my Bachelor's Degree in Science. I began teaching Chemistry, at McCollum High School, in 2013 and have enjoyed my time at Harlandale ISD. 

  • 1st Period (Chemistry): 8:20-9:07

    2nd Period (Chemistry): 9:12-10:15

    3rd Period (Chemistry): 10:20 -11:07

    4th Period (Conference Period): 11:12-11:59

    5th Period (Chemistry): 12:04-12:51

    6th Period (Lunch): 12:39 - 1:26

    7th Period (Chemistry):  1:31-2:18

    8th Period (Chemistry): 2:23-3:09

    9th Period (PLC): 3:14-4:00