Mathematics Faculty & Staff Department Chair Dr. David Garth Mathematics Department Chair; Professor of Mathematics dgarth@truman.edu (660) 785-4044 Office Hours (In person or via Zoom) MWR 1:30-3:30 TF 9:30-11:30 Zoom: You can log in using the link Administrative Assistant Diane Sandefur Administrative Assistant - Computer & Data Sciences and Mathematics sandefur@truman.edu (660) 785-4547 Monday - Friday 7:00AM to 4:00PM Office is open 8:00AM to 5:00PM (You are welcome to come in at 7:00AM as well. But official hours start at 8:00AM.) Faculty Dr. Ian Gossett Assistant Professor of Mathematics igossett@truman.edu (660) 785-4592 Fall 2026 office hours: Mon/Tue/Wed 2:30-5:30 pm & Fri 2:30-3:30 pm Dr. Anna Halfpap Assistant Professor of Mathematics ahalfpap@truman.edu (660) 785-4029 Fall 2026 Office Hours Monday: 10:30-11:20 Tuesday: 10:30-11:20 and 1:30-3:20 Wednesday: 10:30-11:20 Thursday: 10:30-11:20 and 1:30-3:20 Friday: 9:00-10:00 and 11:00-12:00 Dr. Wayne Johnson Assistant Professor of Mathematics and Data Science wjohnson@truman.edu (660) 785-4297 Fall 2026 Office Hours Monday: 8:30am-9:20am and 10:30am-12:20pm Tuesday: 9:30am-10:20am and 1:30pm-2:50pm Wednesday: 10:30am-12:20pm Thursday: 9:30am-10:20am and 1:30pm-2:50pm Personal Pronouns: he/him Dr. Stephen Lacina Assistant Professor of Mathematics slacina@truman.edu (660) 785-4554 Monday 2:30-4:30pm Wednesday 9:30-11:20am and 2:30-4:30pm Thursday 12:30-1:20pm and 3-5pm Friday 9:30-10:20am Dr. Derek Sparrius Assistant Professor of Mathematics dsparrius@truman.edu (660) 785-7829 Monday: 9:00-10:30 AM Tuesday: 9:30 AM - 12:00 PM, 3:30-4:30 PM Wednesday: 9:30-10:30 AM Thursday: 10:30 AM - 12:00 PM, 3:30-4:30 PM Friday: 9:00-10:30 AM Dr. Dana Vazzana Professor of Mathematics and Director of Academic Professional Development dvazzana@truman.edu (660) 785-4547 Office Hours Spring 2026 VH 2144 Monday: 2:30-3:20 Tuesday: 12:30-1:20, 2:30-3:20 Friday: 11:30-2:30 Personal Pronouns: she/her/hers Dr. Tony Vazzana Professor of Mathematics tvazzana@truman.edu (660) 785-4547 Personal Pronouns: He / Him / His Mrs. Vanessa Williams Instructor of Mathematics vwilliams@truman.edu (660) 785-4090 Campus Office Hours MWF: 12:15pm - 1:15pm TR: 12:00pm - 2:30pm Zoom Office Hours Wednesday and Thursday: Meeting ID: 820 7168 0058 Passcode: 917088