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) Monday: 10:30-11:20 Tuesday: 1:30-3:20 Wednesday: 10:30-11:20 and 1:30-3:20 Thursday: 1:30-3:20 Friday: 10:30-11:20 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 Summer office hours: By appointment Dr. Anna Halfpap Assistant Professor of Mathematics ahalfpap@truman.edu (660) 785-4029 Spring 2026 Office Hours Monday: 9:30-10:20 and 3:30-4:20 Tuesday: 9:30-10:20 and 2:30-4:20 Wednesday: 9:30-10:20 and 2:30-4:20 Friday: 10:30-12:20 Dr. Wayne Johnson Assistant Professor of Mathematics and Data Science wjohnson@truman.edu (660) 785-4297 Spring 2026 Office Hours Monday: 9:30am-11:20am Tuesday: 8:30am-9:20am and 1:30pm-2:20pm Wednesday: 9:30am-11:20pm and 1:30pm-2:20pm Thursday: 8:30am-11:20am 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: 11:30-12:20 PM, 2:30-3:00 PM Tuesday: 9:30-10:20 AM, 2:30-3:00 PM Wednesday: 11:30-12:20 PM, 2:30-3:00 PM Thursday: 9:30-10:20 AM, 12:30-1:20 PM, 2:30-3:00 PM Friday: 11:30-12:20 PM, 2:30-3:00 PM Dr. Dana Vazzana Professor of Mathematics and Director of Academic Professional Development dvazzana@truman.edu (660) 785-4392 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 Zoom Office Hours Monday - Thursday: 10:00am - 12:00pm Meeting ID: 847 3907 7955 Passcode: 448004