Due to active expansion efforts, Alpha Sigma Phi continues to offer services and opportunities to over 8,000 undergraduate students and well over 72,000 living members.

[5] Alpha Sigma Phi was founded by three men at Yale College in 1845 as a secret sophomore society composed of many of the school's poets, athletes, and scholars.

[7] The founders of Alpha Sigma Phi were: Manigault and Rhea met at St. Paul's Preparatory School near Flushing, New York, where both were members of the same literary society and were preparing themselves for admission to Yale.

Weiser attended a private school in New Haven, and he met Rhea early in his freshman year, who introduced him to Manigault.

The sophomore class there had only one society, Kappa Sigma Theta, which displayed an attitude of superiority toward non-fraternity men.

However, a fragmentary document in the Yale library suggests that Beta was chartered in 1850 at Harvard University but lived a very short life due to a wave of puritanism.

(a charter document found in Yale archives shows the latter, but Baird's Manual from its earliest editions and later records of the fraternity refer to it as Gamma.)

[6] When the Civil War broke out across the United States, almost every member of Delta at Marietta enlisted in the Union Army.

Because less attention was being given to the sophomore class societies, some Alpha Sigma Phi members pledged to Delta Kappa Epsilon, a junior class society, and attempted to turn the control of Alpha Sigma Phi over to Delta Kappa Epsilon.

Louis Manigault sought to renew his loyalty and friendship with his brothers of Alpha Sigma Phi, and agreed with Rhea and Weiser to consider Delta Beta Xi its true descendant.

At Yale, in fall 1906 four friends agreed in a conversation over a card game that an organization was needed that was open to all students, instead of representing only the sophomore or junior classes.

On March 27, 1907, Ely, Crenshaw, Musgrave, Waldron, and Waterbury traveled to Marietta and were initiated into Alpha Sigma Phi.

[7] Many of the old Alpha members returned to Yale upon hearing the news of the refounding, and helped acquire the fraternity's first piece of real estate, the "Tomb", a windowless two-story building.

[7] Alpha Sigma Phi survived World War I fairly easily and even recruited many new members during those years.

World War II hit Alpha Sigma Phi hard, with many brothers losing their lives due to the conflict, forcing many chapters to close.

In 2006, Alpha Sigma Phi won the North American Interfraternity Conference's Laurel Wreath Award for the Ralph F. Burns Leadership Institute for new members.

In 2018, Grand Historian Emeritus, Robert Kutz, UC-Berkeley '67, established an endowment to allow for this award to once again be bestowed.

Pledges were forced to run errands for initiated members, wear Dora the Explorer backpacks, and carry fruit on campus.